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X.1	International user classes of service in, and categories of access to, public data networks and Integrated Services Digital Networks (ISDNs)
X.2	International data transmission services and optional user facilities in public data networks and ISDNs
X.3	Packet Assembly/Disassembly facility (PAD) in a public data network
X.4	General structure of signals of International Alphabet No. 5 code for character oriented data transmission over public data networks
X.5	Facsimile Packet Assembly/Disassembly facility (FPAD) in a public data network
X.6	Multicast service definition
X.7	Technical characteristics of data transmission services
X.8	Multi-aspect PAD (MAP) framework and service definition
X.10	[Withdrawn] Categories of access for Data Terminal Equipment (DTE) to public data transmission services Deleted as its content is fully covered by ITU-T X.1
X.15	[Withdrawn] Definitions of terms concerning public data networks Withdrawn on 25.11.1988
X.20	Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for start-stop transmission services on public data networks
X.20bis	Use on public data networks of Data Terminal Equipment (DTE) which is designed for interfacing to asynchronous duplex V-Series modems
X.21	Interface between Data Terminal Equipment and Data Circuit-terminating Equipment for synchronous operation on public data networks
X.21bis	Use on public data networks of Data Terminal Equipment (DTE) which is designed for interfacing to synchronous V-Series modems
X.22	Multiplex DTE/DCE interface for user classes 3-6
X.24	List of definitions for interchange circuits between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) on public data networks
X.25	Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit
X.26	Electrical characteristics for unbalanced double-current interchange circuits operating at data signalling rates nominally up to 100 kbit/s This Recommendation is published under alias number V.10
X.27	Electrical characteristics for balanced double-current interchange circuits operating at data signalling rates up to 10 Mbit/s This Recommendation is published under alias number V.11
X.28	DTE/DCE interface for a start-stop mode Data Terminal Equipment accessing the Packet Assembly/Disassembly facility (PAD) in a public data network situated in the same country
X.29	Procedures for the exchange of control information and user data between a Packet Assembly/Disassembly (PAD) facility and a packet mode DTE or another PAD
X.30	Support of X.21, X.21 bis and X.20 bis based Data Terminal Equipments (DTEs) by an Integrated Services Digital Network (ISDN) This Recommendation is also included but not published in I series under alias number I.461
X.31	Support of packet mode terminal equipment by an ISDN This Recommendation is also included but not published in I series under alias number I.462
X.32	Interface between Data terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and accessing a Packet-Switched Public Data Network through a public switched telephone network or an Integrated Services Digital Network or a Circuit-Switched Public Data Network
X.33	Access to packet-switched data transmission services via frame relaying data transmission services
X.34	Access to packet-switched data transmission services via B-ISDN
X.35	Interface between a PSPDN and a private PSDN which is based on X.25 procedures and enhancements to define a gateway function that is provided in the PSPDN
X.36	Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for public data networks providing frame relay data transmission service by dedicated circuit
X.37	Encapsulation in X.25 packets of various protocols including frame relay
X.38	G3 facsimile equipment/DCE interface for G3 facsimile equipment accessing the Facsimile Packet Assembly/Disassembly facility (FPAD) in a public data network situated in the same country
X.39	Procedures for the exchange of control information and user data between a Facsimile Packet Assembly/Disassembly (FPAD) facility and a packet mode Data Terminal Equipment (DTE) or another FPAD
X.40	[Withdrawn] Standardization of frequency-shift modulated transmission systems for the provision of telegraph and data channels by frequency division of a group Withdrawn on 12.03.1993
X.42	Procedures and methods for accessing a public data network from a DTE operating under control of a generalized polling protocol
X.45	Interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for terminals operating in the packet mode and connected to public data networks, designed for efficiency at higher speeds
X.46	Access to FRDTS via B-ISDN
X.48	Procedures for the provision of a basic multicast service for data terminal equipments (DTEs) using Recommendation X.25
X.49	Procedures for the provision of an extended multicast service for data terminal equipments (DTEs) using Recommendation X.25
X.50	Fundamental parameters of a multiplexing scheme for the international interface between synchronous data networks
X.50bis	Fundamental parameters of a 48-kbit/s user data signalling rate transmission scheme for the international interface between synchronous data networks
X.51	Fundamental parameters of a multiplexing scheme for the international interface between synchronous data networks using 10-bit envelope structure
X.51bis	Fundamental parameters of a 48-kbit/s user data signalling rate transmission scheme for the international interface between synchronous data networks using 10-bit envelope structure
X.52	Method of encoding anisochronous signals into a synchronous user bearer
X.53	Numbering of channels on international multiplex links at 64 kbit/s
X.54	Allocation of channels on international multiplex links at 64 kbit/s
X.55	Interface between synchronous data networks using a 6 + 2 envelope structure and single channel per carrier (SCPC) satellite channels
X.56	Interface between synchronous data networks using an 8 + 2 envelope structure and single channel per carrier (SCPC) satellite channels
X.57	Method of transmitting a single lower speed data channel on a 64 kbit/s data stream
X.58	Fundamental parameters of a multiplexing scheme for the international interface between synchronous non-switched data networks using no envelope structure
X.60	Common channel signalling for circuit-switched data applications
X.61	[Withdrawn] Signalling System No. 7 - Data user part This Recommendation is also included but not published in Q series under alias number Q.741
X.70	Terminal and transit control signalling system for start-stop services on international circuits between anisochronous data networks
X.71	Decentralized terminal and transit control signalling system on international circuits between synchronous data networks
X.75	Packet-switched signalling system between public networks providing data transmission services
X.76	Network-to-network interface between public networks providing PVC and/or SVC frame relay data transmission service
X.77	Interworking between PSPDNs via B-ISDN
X.78	Interworking procedures between networks providing frame relay data transmission services via B-ISDN
X.80	Interworking of interexchange signalling systems for circuit-switched data services
X.81	Interworking between an ISDN circuit-switched and a circuit-switched public data network (CSPDN)
X.82	Detailed arrangements for interworking between CSPDNs and PSPDNs based on Recommendation T.70
X.84	Support of frame relay services over MPLS core networks
X.85	IP over SDH using LAPS
X.86	Ethernet over LAPS
X.87	Multiple services ring based on RPR
X.92	Hypothetical reference connections for public synchronous data networks
X.96	Call progress signals in public data networks
X.110	International routing principles and routing plan for Public Data Networks
X.111	Principles for the routing of international frame relay traffic
X.115	Definition of address translation capability in public data networks
X.116	Address translation registration and resolution protocol
X.121	International numbering plan for public data networks
X.122	Numbering plan interworking for the E.164 and X.121 numbering plans This Recommendation is published with the double number E.166 and X.122. For more details see E.166
X.123	Mapping between escape codes and TOA/NPI for E.164/X.121 numbering plan interworking during the transition period
X.124	Arrangements for the interworking of the E.164 and X.121 numbering plans for frame relay and ATM networks
X.125	Procedure for the notification of the assignment of international network identification codes for public frame relay data networks and ATM networks numbered under the E.164 numbering plan
X.130	Call processing delays in public data networks when providing international synchronous circuit-switched data services
X.131	Call blocking in public data networks when providing international synchronous circuit-switched data services
X.134	Portion boundaries and packet-layer reference events: basis for defining packet-switched performance parameters
X.135	Speed of service (delay and throughput) performance values for public data networks when providing international packet-switched services
X.136	Accuracy and dependability performance values for public data networks when providing international packet-switched services
X.137	Availability performance values for public data networks when providing international packet-switched services
X.138	Measurement of performance values for public data networks when providing international packet-switched services
X.139	Echo, drop, generator and test DTEs for measurement of performance values in public data networks when providing international packet-switched services
X.140	General quality of service parameters for communication via public data networks
X.141	General principles for the detection and correction of errors in public data networks A Corrigendum was indicated in 06/1990 for the English version.
X.142	Quality of service metrics for characterizing Frame Relay/ATM service interworking performance
X.144	User information transfer performance parameters for public frame relay data networks
X.145	Connection establishment and disengagement performance parameters for public Frame Relay data networks providing SVC services
X.146	Performance objectives and quality of service classes applicable to frame relay
X.147	Frame Relay network availability
X.148	Procedures for the measurement of the performance of public data networks providing the international frame relay service
X.149	Performance of IP networks when supported by public Frame Relay data networks
X.150	Principles of maintenance testing for public data networks using Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) test loops
X.151	Frame Relay operations and maintenance - Principles and functions
X.Imp160	Customer Network Management Implementors' Guide - Defects and Resolutions
X.160	Architecture for customer network management service for public data networks
X.161	Definition of customer network management services for public data networks
X.162	Definition of management information for customer network management service for public data networks to be used with the CNMc interface
X.163	Definition of management information for customer network management service for public data networks to be used with the CNMe interface
X.170	Network-network management architecture for data networks
X.171	Network-network management services for data networks
X.180	Administrative arrangements for international closed user groups (CUGs)
X.181	Administrative arrangements for the provision of international permanent virtual circuits (PVCs)
X.200	Information technology - Open Systems Interconnection - Basic Reference Model: The basic model
X.Imp200	OSI Implementers' Guide - Version 1.1
X.207	Information technology - Open Systems Interconnection - Application layer structure
X.208	[Withdrawn] Specification of Abstract Syntax Notation One (ASN.1)
X.209	[Withdrawn] Specification of Basic Encoding Rules for Abstract Syntax Notation One (ASN.1)
X.210	Information technology - Open Systems Interconnection - Basic Reference Model: Conventions for the definition of OSI services
X.211	Information technology - Open Systems Interconnection - Physical service definition
X.212	Information technology - Open Systems Interconnection - Data Link service definition
X.213	Information technology - Open Systems Interconnection - Network service definition
X.214	Information technology - Open Systems Interconnection -Transport service definition
X.215	Information technology - Open Systems Interconnection - Session service definition
X.216	Information technology - Open Systems Interconnection - Presentation service definition
X.217	Information technology - Open Systems Interconnection - Service definition for the Association Control Service Element
X.217bis	Information technology - Open Systems Interconnection - Service definition for the Application Service Object Association Control Service Element
X.218	Reliable Transfer: Model and service definition
X.219	Remote Operations: Model, notation and service definition
X.220	Use of X.200-Series protocols in CCITT applications
X.222	Use of X.25 LAPB-compatible Data Link procedures to provide the OSI connection-mode Data Link service This title results from the modification of ITU-T X.222 (04/95) former title by Amendment 1 (10/96).
X.223	Use of X.25 to provide the OSI connection-mode Network service for ITU-T applications
X.224	Information technology - Open Systems Interconnection - Protocol for providing the connection-mode transport service
X.225	Information technology - Open Systems Interconnection - Connection-oriented Session protocol: Protocol specification
X.226	Information technology - Open Systems Interconnection - Connection-oriented Presentation protocol: Protocol specification
X.227	Information technology - Open Systems Interconnection - Connection-oriented protocol for the Association Control Service Element: Protocol specification
X.227bis	Information technology - Open Systems Interconnection - Connection-mode protocol for the Application Service Object Association Control Service Element
X.228	Reliable Transfer: Protocol specification
X.229	Remote Operations: Protocol specification
X.233	Information technology - Protocol for providing the connectionless-mode network service: Protocol specification
X.234	Information technology - Protocol for providing the OSI connectionless-mode transport service
X.235	Information technology - Open Systems Interconnection - Connectionless Session protocol: Protocol specification
X.236	Information technology - Open Systems Interconnection - Connectionless Presentation protocol: Protocol specification
X.237	Information technology - Open Systems Interconnection - Connectionless protocol for the Association Control Service Element: Protocol specification
X.237bis	Information technology - Open Systems Interconnection - Connectionless protocol for the Application Service Object Association Control Service Element
X.244	[Withdrawn] Procedure for the exchange of protocol identification during virtual call establishment on Packet Switched Public Data Networks Superseded by the more comprehensive description of protocol identifiers contained in X.263
X.245	Information technology - Open Systems Interconnection - Connection-oriented Session protocol: Protocol Implementation Conformance Statement (PICS) proforma
X.246	Information technology - Open Systems Interconnection - Connection-oriented Presentation protocol: Protocol Implementation Conformance Statement (PICS) proforma
X.247	Information technology - Open Systems Interconnection - Protocol specification for the Association Control Service Element: Protocol Implementation Conformance Statement (PICS) proforma
X.248	Information technology - Open Systems Interconnection - Reliable Transfer: Protocol Implementation Conformance Statement (PICS) proforma
X.249	Information technology - Open Systems Interconnection - Remote Operations: Protocol Implementation Conformance Statement (PICS) proforma
X.255	Information technology - Open Systems Interconnection - Connectionless Session protocol: Protocol Implementation Conformance Statement (PICS) proforma
X.256	Information technology - Open Systems Interconnection - Connectionless Presentation protocol: Protocol Implementation Conformance Statement (PICS) proforma
X.257	Information technology - Open Systems Interconnection - Connectionless protocol for the Association Control Service Element: Protocol Implementation Conformance Statement (PICS) proforma
X.260	Information technology - Framework for protocol identification and encapsulation
X.263	Information technology - Protocol identification in the Network Layer
X.264	Transport protocol identification mechanism
X.272	Data compression and privacy over frame relay networks
X.273	Information technology - Open Systems Interconnection - Network layer security protocol
X.274	Information technology - Telecommunication and information exchange between systems - Transport layer security protocol
X.281	Information technology - Elements of management information related to the OSI Physical Layer
X.282	Elements of management information related to the OSI Data Link layer
X.283	Information technology - Elements of management information related to the OSI Network layer
X.284	Information technology - Elements of management information related to the OSI Transport layer
X.287	Information technology - Open Systems Interconnection - Structure of management information: Managed objects for supporting upper layers
X.290	OSI conformance testing methodology and framework for protocol Recommendations for ITU-T applications - General concepts
X.291	OSI conformance testing methodology and framework for protocol Recommendations for ITU-T applications - Abstract test suite specification
X.292	OSI conformance testing methodology and framework for protocol Recommendations for ITU-T applications - The Tree and Tabular Combined Notation (TTCN)
X.293	OSI conformance testing methodology and framework for protocol Recommendations for ITU-T applications - Test realization
X.294	OSI conformance testing methodology and framework for protocol Recommendations for ITU-T applications - Requirements on test laboratories and clients for the conformance assessment process
X.295	OSI conformance testing methodology and framework for protocol Recommendations for ITU-T applications - Protocol profile test specification
X.296	OSI conformance testing methodology and framework for protocol Recommendations for ITU-T applications - Implementation conformance statements
X.300	General principles for interworking between public networks and between public networks and other networks for the provision of data transmission services
X.301	Description of the general arrangements for call control within a subnetwork and between subnetworks for the provision of data transmission services
X.302	Description of the general arrangements for internal network utilities within a subnetwork and intermediate utilities between subnetworks for the provision of data transmission services
X.305	Functionalities of subnetworks relating to the support of the OSI connection-mode network service
X.320	General arrangements for interworking between Integrated Services Digital Networks (ISDNs) for the provision of data transmission services
X.321	General arrangements for interworking between Circuit-Switched Public Data Networks (CSPDNs) and Integrated Services Digital Networks (ISDNs) for the provision of data transmission services This Recommendation is also included but not published in I series under alias number I.540
X.322	General arrangements for interworking between Packet-Switched Public Data Networks (PSPDNs) and Circuit-Switched Public Data Networks (CSPDNs) for the provision of data transmission services
X.323	General arrangements for interworking between Packet-Switched Public Data Networks (PSPDNs)
X.324	General arrangements for interworking between Packet-Switched Public Data Networks (PSPDNs) and public mobile systems for the provision of data transmission services
X.325	General arrangements for interworking between Packet-Switched Public Data Networks (PSPDNs) and Integrated Services Digital Networks (ISDNs) for the provision of data transmission services This Recommendation is also included but not published in I series under alias number I.550
X.326	General arrangements for interworking between Packet-Switched Public Data Networks (PSPDNs) and Common Channel Signalling Network (CCSN)
X.327	General arrangements for interworking between Packet-Switched Public Data Networks (PSPDNs) and private data networks for the provision of data transmission services
X.328	General arrangements for interworking between Public Data Networks providing frame relay data transmission services and Integrated Services Digital Networks (ISDNs) for the provision of data transmission services
X.329	General arrangements for interworking between networks providing frame relay data transmission services and B-ISDN
X.340	General arrangements for interworking between a Packet-Switched Public Data Network (PSPDN) and the international telex network
X.350	General interworking requirements to be met for data transmission in international public mobile satellite systems
X.351	Special requirements to be met for Packet Assembly/Disassembly facilities (PADs) located at or in association with coast earth stations in the public mobile satellite service
X.352	Interworking between Packet-Switched Public Data Networks and public maritime mobile satellite data transmission systems
X.353	Routing principles for interconnecting public maritime mobile satellite data transmission systems with public data networks
X.361	Connection of VSAT systems with Packet-Switched Public Data Networks based on X.25 procedures
X.370	[Withdrawn] Arrangements for the transfer of internetwork management information Deleted because it was such a general Recommendation that it served no useful practical purpose
X.371	General arrangements for interworking between Public Data Networks and the Internet
X.400	Message handling services: Message handling system and service overview
X.Imp400	MHS Implementors' Guide
X.402	Information technology - Message Handling Systems (MHS): Overall architecture
X.403	[Withdrawn] Message handling systems: conformance testing This Recommendation was withdrawn because conformance testing concepts and methods defined in it were related to the 1984 MHS Recommendations and were not aligned with either the first or second versions of conformance testing standards. ITU-T X.480 (1992) refers to the 1988 "Blue Book" MHS Recommendations and was better aligned with the testing standards
X.404	Information technology - Message Handling Systems (MHS): MHS routing - Guide for messaging systems managers
X.407	[Withdrawn] Message handling systems: Abstract service definition conventions This Recommendation was not referenced from any Recommendation and some of its technical content was contained in ITU-T X.402 (1995)
X.408	Message handling systems: Encoded information type conversion rules
X.410	[Withdrawn] Message handling systems: remote operations and reliable transfer server Withdrawn on 25.11.1988
X.411	Information technology - Message Handling Systems (MHS): Message Transfer System: Abstract Service Definition and Procedures
X.412	Information technology - Message Handling Systems (MHS): MHS routing
X.413	Information technology - Message Handling Systems (MHS): Message store - Abstract service definition
X.419	Information technology - Message Handling Systems (MHS): Protocol Specifications
X.420	Information technology - Message Handling Systems (MHS): Interpersonal Messaging System
X.421	Message handling systems: COMFAX use of MHS
X.435	Information technology - Message Handling Systems (MHS): Electronic data interchange messaging system
X.440	Message handling systems: Voice messaging system
X.445	Asynchronous protocol specification - Provision of OSI connection mode network service over the telephone network
X.446	Common messaging call API
X.460	Information technology - Message Handling Systems (MHS) Management: Model and architecture
X.462	Information technology - Message Handling Systems (MHS) Management: Logging information
X.467	Information technology - Message Handling Systems (MHS) Management: Message Transfer Agent management
X.480	[Withdrawn] Message handling systems and directory services - conformance testing Withdrawn as it references documents that have been deleted by the ITU
X.481	Message handling systems - P2 protocol PICS proforma
X.482	Message handling systems - P1 Protocol PICS proforma
X.483	Message handling systems - P3 Protocol PICS proforma
X.484	Message handling systems - P7 protocol PICS proforma
X.485	Message handling systems: Voice messaging system Protocol Implementation Conformance Statement (PICS) proforma
X.486	Message handling systems - Pedi protocol PICS proforma
X.487	Message handling systems - IPM-MS attributes PICS proforma
X.488	Message handling systems - EDI-MS attributes PICS proforma
X.500	Information technology - Open Systems Interconnection - The Directory: Overview of concepts, models and services
X.Imp500	Directory Implementors' Guide
X.501	Information technology - Open Systems Interconnection - The Directory: Models
X.508	The Directory: Key management and public-key infrastructure establishment and maintenance
X.509	Information technology - Open Systems Interconnection - The Directory: Public-key and attribute certificate frameworks
X.510	Information Technology - Open systems Interconnection - The Directory - Protocol specifications for secure operations
X.511	Information technology - Open Systems Interconnection - The Directory: Abstract service definition
X.518	Information technology - Open Systems Interconnection - The Directory: Procedures for distributed operation
X.519	Information technology - Open Systems Interconnection - The Directory: Protocol specifications
X.520	Information technology - Open Systems Interconnection - The Directory: Selected attribute types
X.521	Information technology - Open Systems Interconnection - The Directory: Selected object classes
X.525	Information technology - Open Systems Interconnection - The Directory: Replication
X.530	Information technology - Open Systems Interconnection - The Directory: Use of systems management for administration of the Directory
X.581	[Withdrawn] Information technology - Open Systems Interconnection - The Directory: Directory Access Protocol - Protocol Implementation Conformance Statement (PICS) proforma
X.582	[Withdrawn] Information technology - Open Systems Interconnection - The Directory: Directory System Protocol - Protocol Implementation Conformance Statement (PICS) proforma
X.583	[Withdrawn] Information technology - Open Systems Interconnection - The Directory: Protocol Implementation Conformance Statement (PICS) Proforma for the Directory Access Protocol
X.584	[Withdrawn] Information technology - Open Systems Interconnection - The Directory: Protocol Implementation Conformance Statement (PICS) Proforma for the Directory System Protocol
X.585	[Withdrawn] Information technology - Open Systems Interconnection - The Directory: Protocol Implementation Conformance Statement (PICS) Proforma for the Directory Operational Binding Management Protocol
X.586	[Withdrawn] Information technology - Open Systems Interconnection - The Directory: Protocol Implementation Conformance Statement (PICS) Proforma for the Directory Information Shadowing Protocol
X.590	JSON signature scheme (JSS)
X.601	Multi-peer communications framework
X.602	Information technology - Group management protocol
X.603	Information technology - Relayed multicast protocol: Framework
X.603.1	Information technology - Relayed multicast protocol: Specification for simplex group applications
X.603.2	Information technology - Relayed multicast protocol: Specification for N-plex group applications
X.604	Information technology - Mobile multicast communications: Framework
X.604.1	Information technology - Mobile multicast communications: Protocol over native IP multicast networks
X.604.2	Information technology - Mobile multicast communications: Protocol over overlay multicast networks
X.605	Information technology - Enhanced Communications Transport Service definition
X.606	Information technology - Enhanced Communications Transport Protocol: Specification of simplex multicast transport
X.606.1	Information technology - Enhanced Communications Transport Protocol: Specification of QoS management for simplex multicast transport
X.607	Information technology - Enhanced communications transport protocol: Specification of duplex multicast transport
X.607.1	Information technology - Enhanced communications transport protocol: Specification of QoS management for duplex multicast transport
X.608	Information technology - Enhanced communications transport protocol: Specification of N-plex multicast transport
X.608.1	Information technology - Enhanced communications transport protocol: Specification of QoS management for n-plex multicast transport
X.609	Managed peer-to-peer (P2P) communications: Functional architecture
X.609.1	Managed P2P communications: Peer activity management protocol (PAMP)
X.609.2	Managed P2P communications: Overlay resource control protocol (ORCP)
X.609.3	Managed P2P communications: Multimedia streaming signalling requirements
X.609.4	Managed P2P communications: Multimedia streaming peer protocol
X.609.5	Managed P2P communications: Overlay management protocol
X.609.6	Managed P2P communications: Content distribution signalling requirements
X.609.7	Managed P2P communications: Content distribution peer protocol
X.609.8	Managed P2P communications: Management protocol for live data sources
X.609.9	Managed P2P communications: Overlay content management protocol
X.609.10	Managed P2P communications: Signalling requirements for data streaming
X.610	Provision and support of the OSI connection-mode Network service
X.612	Information technology - Provision of the OSI connection-mode network service by packet-mode terminal equipment connected to an Integrated Services Digital Network (ISDN)
X.613	Information technology - Use of X.25 Packet Layer Protocol in conjunction with X.21/X.21 bis to provide the OSI connection-mode Network service
X.614	Information technology - Use of X.25 Packet Layer Protocol to provide the OSI connection-mode Network service over the telephone network
X.622	Information technology - Protocol for providing the connectionless-mode Network service: Provision of the underlying service by an X.25 Subnetwork
X.623	Information technology - Protocol for providing the connectionless-mode Network service: Provision of the underlying service by a subnetwork that provides the OSI Data Link service
X.625	Information technology - Protocol for providing the connectionless-mode Network service: Provision of the underlying service by ISDN circuit-switched B-channels
X.630	Efficient Open Systems Interconnection (OSI) operations
X.633	Information technology - Open Systems Interconnection - Network Fast Byte Protocol
X.634	Information technology - Open Systems Interconnection - Transport Fast Byte Protocol
X.637	Basic connection-oriented common upper layer requirements
X.638	Minimal OSI facilities to support basic communications applications
X.639	Basic connection-oriented requirements for ROSE-based profiles
X.641	Information technology - Quality of service: framework
X.642	Information technology - Quality of service - Guide to methods and mechanisms
X.650	Information technology - Open Systems Interconnection - Basic Reference Model: Naming and addressing
X.660	Information technology - Procedures for the operation of object identifier registration authorities: General procedures and top arcs of the international object identifier tree
X.662	Information technology - Open Systems Interconnection - Procedures for the operation of OSI Registration Authorities: Registration of object identifier arcs beneath the top-level arc jointly administered by ISO and ITU-T
X.665	Information technology - Open Systems Interconnection - Procedures for the operation of OSI Registration Authorities: Registration of application processes and application entities
X.666	Information technology - Open Systems Interconnection - Procedures for the operation of OSI Registration Authorities: Joint ISO and ITU-T registration of international organizations
X.667	Information technology - Procedures for the operation of object identifier registration authorities: Generation of universally unique identifiers and their use in object identifiers
X.668	Information technology - Open Systems Interconnection - Procedures for the operation of OSI Registration Authorities: Registration of object identifier arcs for applications and services using tag-based identification
X.669	Procedures for ITU-T registration of identified organizations
X.670	Use of registration agents to register names subordinate to country names in the X.660 RH-name-tree
X.671	Procedures for a Registration Authority operating on behalf of countries to register organization names subordinate to country names in the X.660 RH-name-tree
X.672	Information technology - Open systems interconnection - Object identifier resolution system
X.674	Procedures for the registration of arcs under the Alerting object identifier arc
X.675	OID-based resolution framework for heterogeneous identifiers and locators
X.676	Object identifier-based resolution framework for IoT grouped services
X.677	Identification mechanism for unmanned aerial vehicles using object identifiers
X.680	Information technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation
X.681	Information technology - Abstract Syntax Notation One (ASN.1): Information object specification
X.682	Information technology - Abstract Syntax Notation One (ASN.1): Constraint specification
X.683	Information technology - Abstract Syntax Notation One (ASN.1): Parameterization of ASN.1 specifications
X.690	Information technology - ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER)
X.691	Information technology - ASN.1 encoding rules: Specification of Packed Encoding Rules (PER)
X.692	Information technology - ASN.1 encoding rules: Specification of Encoding Control Notation (ECN)
X.693	Information technology - ASN.1 encoding rules: XML Encoding Rules (XER)
X.694	Information technology - ASN.1 encoding rules: Mapping W3C XML schema definitions into ASN.1
X.695	Information technology - ASN.1 encoding rules: Registration and application of PER encoding instructions
X.696	Information technology - ASN.1 encoding rules: Specification of Octet Encoding Rules (OER)
X.697	Information technology - ASN.1 encoding rules: Specification of JavaScript Object Notation Encoding Rules (JER)
X.700	Management framework for Open Systems Interconnection (OSI) for CCITT applications
X.Imp700	X.700-Series - OSI Systems Management Implementors' Guide
X.701	Information technology - Open Systems Interconnection - Systems management overview
X.702	Information technology - Open Systems Interconnection - Application context for systems management with transaction processing
X.703	Information technology - Open Distributed Management Architecture
X.710	Information technology - Open Systems Interconnection - Common Management Information service
X.711	Information technology - Open Systems Interconnection - Common Management Information Protocol: Specification
X.712	Information technology - Open Systems Interconnection - Common management information protocol: Protocol Implementation Conformance Statement (PICS) proforma
X.720	Information technology - Open Systems Interconnection - Structure of management information: Management information model
X.721	Information technology - Open Systems Interconnection - Structure of management information: Definition of management information
X.722	Information technology - Open Systems Interconnection - Structure of management information: Guidelines for the definition of managed objects
X.723	Information technology - Open Systems Interconnection - Structure of management information: Generic management information
X.724	Information technology - Open Systems Interconnection - Structure of management information: Requirements and guidelines for implementation conformance statement proformas associated with OSI management
X.725	Information technology - Open Systems Interconnection - Structure of management information: General Relationship Model
X.727	Information technology - Open Systems Interconnection - Structure of management information: Systems management application layer managed objects
X.730	Information technology - Open Systems Interconnection - Systems Management: Object management function
X.731	Information technology - Open Systems Interconnection - Systems management: State management function
X.732	Information technology - Open Systems Interconnection - Systems Management: Attributes for representing relationships
X.733	Information technology - Open Systems Interconnection - Systems Management: Alarm reporting function
X.734	Information technology - Open Systems Interconnection - Systems Management: Event report management function
X.735	Information technology - Open Systems Interconnection - Systems Management: Log control function
X.736	Information technology - Open Systems Interconnection - Systems Management: Security alarm reporting function
X.737	Information technology - Open Systems Interconnection - Systems Management: Confidence and diagnostic test categories
X.738	Information technology - Open Systems Interconnection - Systems management: Summarization function
X.739	Information technology - Open Systems Interconnection - Systems Management: Metric objects and attributes
X.740	Information technology - Open Systems Interconnection - Systems Management: Security audit trail function
X.741	Information technology - Open Systems Interconnection - Systems management: Objects and attributes for access control
X.742	Information technology - Open Systems Interconnection - Systems management: Usage metering function for accounting purposes
X.743	Information technology - Open Systems Interconnection - Systems Management: Time Management Function
X.744	Information technology - Open Systems Interconnection - Systems Management: Software management function
X.744.1	CORBA-based TMN software management service
X.745	Information technology - Open Systems Interconnection - Systems Management: Test management function
X.746	Information technology - Open Systems Interconnection - Systems Management: Scheduling function
X.748	Information technology - Open Systems Interconnection - Systems Management: Response Time Monitoring Function
X.749	Information technology - Open Systems Interconnection - Systems Management: Management domain and management policy management function
X.750	Information technology - Open Systems Interconnection - Systems Management: Management knowledge management function
X.751	Information technology - Open Systems Interconnection - Systems Management: Changeover function
X.753	Information technology - Open Systems Interconnection - Systems management: Command Sequencer for Systems Management
X.754	Enhanced Event Control Function
X.760	The measurement framework for the statistical indicators of website traffic
X.770	ODMA notification dispatch function
X.780	TMN guidelines for defining CORBA managed objects
X.780.1	TMN guidelines for defining coarse-grained CORBA managed object interfaces
X.780.2	TMN guidelines for defining service-oriented CORBA managed objects and façade objects
X.781	Requirements and guidelines for Implementation Conformance Statements proformas associated with CORBA-based systems
X.782	Guidelines for defining web services for managed objects and management interfaces
X.783	Guidelines for implementation conformance statement proformas associated with web services-based management systems
X.784	Guidelines for implementation conformance statements proformas associated with SNMP-based management systems
X.785	Guidelines for defining REST-based managed objects and management interfaces
X.786	Guidelines for implementation conformance statement proformas associated with REST-based management systems
X.790	Trouble management function for ITU-T applications
X.791	Profile for trouble management function for ITU-T applications
X.792	Configuration audit support function for ITU-T applications
X.800	Security architecture for Open Systems Interconnection for CCITT applications
X.802	Information technology - Lower layers security model
X.803	Information technology - Open Systems Interconnection - Upper layers security model
X.805	Security architecture for systems providing end-to-end communications
X.810	Information technology - Open Systems Interconnection - Security frameworks for open systems: Overview
X.811	Information technology - Open Systems Interconnection - Security frameworks for open systems: Authentication framework
X.812	Information technology - Open Systems Interconnection - Security frameworks for open systems: Access control framework
X.813	Information technology - Open Systems Interconnection - Security frameworks for open systems: Non-repudiation framework
X.814	Information technology - Open Systems Interconnection - Security frameworks for open systems: Confidentiality framework
X.815	Information technology - Open Systems Interconnection - Security frameworks for open systems: Integrity framework
X.816	Information technology - Open Systems Interconnection - Security frameworks for open systems: Security audit and alarms framework
X.830	Information technology - Open Systems Interconnection - Generic upper layers security: Overview, models and notation
X.831	Information technology - Open Systems Interconnection - Generic upper layers security: Security Exchange Service Element (SESE) service definition
X.832	Information technology - Open Systems Interconnection - Generic upper layers security: Security Exchange Service Element (SESE) protocol specification
X.833	Information technology - Open Systems Interconnection - Generic upper layers security: Protecting transfer syntax specification
X.834	Information technology - Open Systems Interconnection - Generic Upper Layers Security: Security Exchange Service Element (SESE) Protocol Implementation Conformance Statement (PICS) proforma
X.835	Information technology - Open Systems Interconnection - Generic Upper Layers Security: Protecting transfer syntax Protocol Implementation Conformance Statement (PICS) proforma
X.841	Information technology - Security techniques - Security information objects for access control
X.842	Information technology - Security techniques - Guidelines for the use and management of trusted third party services
X.843	Information technology - Security techniques - Specification of TTP services to support the application of digital signatures
X.851	Information technology - Open Systems Interconnection - Service definition for the Commitment, Concurrency and Recovery service element
X.852	Information technology - Open Systems Interconnection - Protocol for the Commitment, Concurrency and Recovery service element: Protocol specification
X.853	Information technology - Open Systems Interconnection - Protocol for the Commitment, Concurrency and Recovery service element: Protocol Implementation Conformance Statement (PICS) proforma
X.860	Open Systems Interconnection - Distributed Transaction Processing: Model
X.861	Open Systems Interconnection - Distributed Transaction Processing: Service definition
X.862	Open Systems Interconnection - Distributed Transaction Processing: Protocol specification
X.863	Information technology - Open Systems Interconnection - Distributed Transaction Processing: Protocol Implementation Conformance Statement (PICS) proforma
X.880	Information technology - Remote Operations: Concepts, model and notation
X.881	Information technology - Remote Operations: OSI realizations - Remote Operations Service Element (ROSE) service definition
X.882	Information technology - Remote Operations: OSI realizations - Remote Operations Service Element (ROSE) protocol specification
X.891	Information technology - Generic applications of ASN.1: Fast infoset
X.892	Information technology - Generic applications of ASN.1: Fast Web Services
X.893	Information technology - Generic applications of ASN.1: Fast infoset security
X.894	Information technology - Generic applications of ASN.1: Cryptographic message syntax
X.901	Information technology - Open Distributed Processing - Reference Model: Overview
X.902	Information technology - Open Distributed Processing - Reference model: Foundations
X.903	Information technology - Open Distributed Processing - Reference model: Architecture
X.904	Information technology - Open Distributed Processing - Reference Model: Architectural Semantics
X.906	Information technology - Open distributed processing - Use of UML for ODP system specifications
X.910	Information technology - Open Distributed Processing - Naming framework
X.911	Information technology - Open distributed processing - Reference model - Enterprise language
X.920	Information technology - Open Distributed Processing - Interface Definition Language
X.930	Information technology - Open Distributed Processing - Interface references and binding
X.931	Information technology - Open Distributed Processing - Protocol support for computational interactions
X.950	Information technology - Open Distributed Processing - Trading Function: Specification
X.952	Information technology - Open Distributed Processing - Trading function: Provision of trading function using OSI Directory service
X.960	Information technology - Open Distributed Processing - Type repository function
X.1011	Guidelines for continuous protection of the service access process
X.1031	Roles of end users and telecommunications networks within security architecture
X.1032	Architecture of external interrelationships for a telecommunication IP-based network security system
X.1033	Guidelines on security of individual information services provided by operators
X.1034	Guidelines on extensible authentication protocol based authentication and key management in a data communication network
X.1035	Password-authenticated key exchange (PAK) protocol
X.1036	Framework for creation, storage, distribution and enforcement of policies for network security
X.1037	IPv6 technical security guidelines
X.1038	Security requirements and reference architecture for software-defined networking
X.1039	Technical security measures for implementation of ITU-T X.805 security dimensions
X.1040	Security reference architecture for lifecycle management of e-commerce business data
X.1041	Security framework for voice-over-long-term-evolution (VoLTE) network operation
X.1042	Security services using software-defined networking
X.1043	Security framework and requirements for service function chaining based on software-defined networking
X.1044	Security requirements of network virtualization
X.1045	Security service chain architecture for networks and applications
X.1046	Framework of software-defined security in software-defined networks/network functions virtualization networks
X.1047	Security requirements and architecture for network slice management and orchestration
X.1051	Information security, cybersecurity and privacy protection - Information security controls based on ISO/IEC 27002 for telecommunications organizations
X.1052	Information security management processes for telecommunication organizations
X.1053	Code of practice for information security controls based on ITU-T X.1051 for small and medium-sized telecommunication organizations
X.1054	Information security, cybersecurity and privacy protection - Governance of information security
X.1055	Risk management and risk profile guidelines for telecommunication organizations
X.1056	Security incident management guidelines for telecommunications organizations
X.1057	Asset management guidelines in telecommunication organizations
X.1058	Information technology - Security techniques - Code of practice for personally identifiable information protection
X.1059	Implementation guidance for telecommunication organizations on risk management of their assets globally accessible in IP-based networks
X.1060	Framework for the creation and operation of a cyber defence centre
X.1061	Cyber insurance acquisition guidelines
X.1080.0	Access control for telebiometrics data protection
X.1080.1	e-Health and world-wide telemedicines - Generic telecommunication protocol
X.1080.2	Biology-to-machine (B2M) protocol
X.1081	The telebiometric multimodal model - A framework for the specification of security and safety aspects of telebiometrics
X.1082	Telebiometrics related to human physiology
X.1083	Information technology - Biometrics - BioAPI interworking protocol
X.1084	Telebiometrics system mechanism - Part 1: General biometric authentication protocol and system model profiles for telecommunications systems
X.1085	Information technology - Security techniques - Telebiometric authentication framework using biometric hardware security module
X.1086	Telebiometrics protection procedures - Part 1: A guideline to technical and managerial countermeasures for biometric data security
X.1087	Technical and operational countermeasures for telebiometric applications using mobile devices
X.1088	Telebiometrics digital key framework (TDK) - A framework for biometric digital key generation and protection
X.1089	Telebiometrics authentication infrastructure (TAI)
X.1090	Authentication framework with one-time telebiometric templates
X.1091	A guideline for evaluating telebiometric template protection techniques
X.1092	Integrated framework for telebiometric data protection in e-health and telemedicine
X.1093	Telebiometric access control with smart ID cards
X.1094	Telebiometric authentication using biosignals
X.1095	Entity authentication service for pet animals using telebiometrics
X.1101	Security requirements and framework for multicast communication
X.1111	Framework of security technologies for home network
X.1112	Device certificate profile for the home network
X.1113	Guideline on user authentication mechanisms for home network services
X.1114	Authorization framework for home networks
X.1121	Framework of security technologies for mobile end-to-end data communications
X.1122	Guideline for implementing secure mobile systems based on PKI
X.1123	Differentiated security service for secure mobile end-to-end data communication
X.1124	Authentication architecture for mobile end-to-end data communication
X.1125	Correlative Reacting System in mobile data communication
X.1126	Guidelines on mitigating the negative effects of infected terminals in mobile networks
X.1127	Functional security requirements and architecture for mobile phone anti-theft measures
X.1141	Security Assertion Markup Language (SAML 2.0)
X.1142	eXtensible Access Control Markup Language (XACML 2.0)
X.1143	Security architecture for message security in mobile web services
X.1144	eXtensible Access Control Markup Language (XACML) 3.1
X.1145	Security framework and requirements for open capabilities of telecommunication services
X.1146	Secure protection guidelines for value-added services provided by telecommunication operators
X.1147	Security requirements and framework for big data analytics in mobile Internet services
X.1148	Framework of de-identification process for telecommunication service providers
X.1149	Security framework of an open platform for FinTech services
X.1150	Security assurance framework for digital financial services
X.1151	Guideline on secure password-based authentication protocol with key exchange
X.1152	Secure end-to-end data communication techniques using trusted third party services
X.1153	Management framework of a one time password-based authentication service
X.1154	General framework of combined authentication on multiple identity service provider environments
X.1155	Guidelines on local linkable anonymous authentication for electronic services
X.1156	Non-repudiation framework based on a one-time password
X.1157	Technical capabilities of fraud detection and response for services with high assurance level requirements
X.1158	Multi-factor authentication mechanisms using a mobile device
X.1159	Delegated non-repudiation architecture based on ITU-T X.813
X.1161	Framework for secure peer-to-peer communications
X.1162	Security architecture and operations for peer-to-peer networks
X.1163	Security requirements and mechanisms of peer-to-peer-based telecommunication networks
X.1164	Use of service providers' user authentication infrastructure to implement public key infrastructure for peer-to-peer networks
X.1171	Threats and requirements for protection of personally identifiable information in applications using tag-based identification
X.1191	Functional requirements and architecture for IPTV security aspects
X.1192	Functional requirements and mechanisms for the secure transcodable scheme of IPTV
X.1193	Key management framework for secure internet protocol television (IPTV) services
X.1194	Algorithm selection scheme for service and content protection descrambling
X.1195	Service and content protection interoperability scheme
X.1196	Framework for the downloadable service and content protection system in the mobile Internet Protocol television environment
X.1197	Guidelines on criteria for selecting cryptographic algorithms for IPTV service and content protection
X.1198	Virtual machine-based security platform for renewable IPTV service and content protection
X.1205	Overview of cybersecurity
X.1206	A vendor-neutral framework for automatic notification of security related information and dissemination of updates
X.1207	Guidelines for telecommunication service providers for addressing the risk of spyware and potentially unwanted software
X.1208	A cybersecurity indicator of risk to enhance confidence and security in the use of telecommunication/information and communication technologies
X.1209	Capabilities and their context scenarios for cybersecurity information sharing and exchange
X.1210	Overview of source-based security troubleshooting mechanisms for Internet protocol-based networks
X.1211	Techniques for preventing web-based attacks
X.1212	Design considerations for improved end-user perception of trustworthiness indicators
X.1213	Security capability requirements for countering smartphone-based botnets
X.1214	Security assessment techniques in telecommunication/information and communication technology networks
X.1215	Use cases for structured threat information expression
X.1216	Requirements for collection and preservation of cybersecurity incident evidence
X.1217	Guidelines for applying threat intelligence in telecommunication network operation
X.1218	Requirements and guidelines for dynamic malware analysis in a sandbox environment
X.1219	Functional requirements for a secured process to evaluate technical vulnerabilities
X.1220	Security framework for storage protection against malware attacks on hosts
X.1231	Technical strategies for countering spam
X.1232	Technical framework for countering advertising spam in user-generated information
X.1233	Guidelines for countering spam over instant messaging
X.1234	Guidelines for countering multimedia messaging service spam
X.1235	Technologies in countering website spoofing for telecommunication organizations
X.1236	Security requirements and countermeasures for targeted email attacks
X.1237	Technical security framework for personally identifiable information protection while countering mobile messaging spam
X.1240	Technologies involved in countering e-mail spam
X.1241	Technical framework for countering email spam
X.1242	Short message service (SMS) spam filtering system based on user-specified rules
X.1243	Interactive gateway system for countering spam
X.1244	Overall aspects of countering spam in IP-based multimedia applications
X.1245	Framework for countering spam in IP-based multimedia applications
X.1246	Technologies involved in countering voice spam in telecommunication organizations
X.1247	Technical framework for countering mobile messaging spam
X.1248	Technical requirements for countering instant messaging spam
X.1249	Technical framework for countering mobile in-application advertising spam
X.1250	Baseline capabilities for enhanced global identity management and interoperability
X.1251	A framework for user control of digital identity
X.1252	Baseline identity management terms and definitions
X.1253	Security guidelines for identity management systems
X.1254	Entity authentication assurance framework
X.1255	Framework for discovery of identity management information
X.1256	Guidelines and framework for sharing network authentication results with service applications
X.1257	Identity and access management taxonomy
X.1258	Enhanced entity authentication based on aggregated attributes
X.1261	Policy framework including principles for digital identity infrastructure
X.1275	Guidelines on protection of personally identifiable information in the application of RFID technology
X.1276	Authentication step-up protocol and metadata Version 1.0
X.1277	Universal authentication framework
X.1277.2	Universal authentication framework protocol specification
X.1278	Client to authenticator protocol/Universal 2-factor framework
X.1278.2	Client to authenticator protocol
X.1279	Framework of enhanced authentication using telebiometrics with anti-spoofing detection mechanisms
X.1280	Framework for out-of-band server authentication using mobile devices
X.1281	APIs for interoperability of identity management systems
X.1282	Security measures for countering password-related online attacks
X.1283	Threat Analysis and guidelines for securing password and password-less authentication solutions
X.1303	Common alerting protocol (CAP 1.1)
X.1303bis	Common alerting protocol (CAP 1.2)
X.1311	Information technology - Security framework for ubiquitous sensor networks
X.1312	Ubiquitous sensor network middleware security guidelines
X.1313	Security requirements for wireless sensor network routing
X.1314	Security requirements and framework of ubiquitous networking
X.1331	Security guidelines for home area network (HAN) devices in smart grid systems
X.1332	Security guidelines for smart metering services in smart grids
X.1333	Security guidelines for use of remote access tools in Internet-connected control systems
X.1341	Certified mail transport and certified post office protocols
X.1352	Security requirements for Internet of things devices and gateways
X.1353	Blockchain-based Security Methodology for Zero-Touch Deployment of Massive IoT
X.1354	Security controls for IoT systems
X.1361	Security framework for the Internet of things based on the gateway model
X.1362	Simple encryption procedure for Internet of things (IoT) environments
X.1363	Technical framework of personally identifiable information handling system in Internet of things environment
X.1364	Security requirements and framework for narrowband Internet of things
X.1365	Security methodology for the use of identity-based cryptography in support of Internet of things (IoT) services over telecommunication networks
X.1366	Aggregate message authentication schemes for Internet of things environment
X.1367	Standard format for Internet of things error logs for security incident operations
X.1368	Secure firmware or software update for Internet of things devices
X.1369	Security requirements for IoT service platform
X.1371	Security threats to connected vehicles
X.1372	Security guidelines for vehicle-to-everything (V2X) communication
X.1373	Secure software update capability for intelligent transportation system communication devices
X.1374	Security requirements for external interfaces and devices with vehicle access capability
X.1375	Guidelines for an intrusion detection system for in-vehicle networks
X.1376	Security-related misbehaviour detection mechanism using big data for connected vehicles
X.1377	Guidelines for an intrusion prevention system for connected vehicles
X.1379	Security requirements for roadside units in intelligent transportation systems
X.1380	Security guidelines for cloud-based event data recorders in automotive environments
X.1381	Security guidelines for Ethernet-based in-vehicle networks
X.1382	Guidelines for sharing security threat information on connected vehicles
X.1383	Security requirements for categorized data in vehicle-to-everything (V2X) communication
X.1384	Security requirements and guidelines for vehicular edge computing
X.1400	Terms and definitions for distributed ledger technology
X.1401	Security threats of distributed ledger technology
X.1402	Security framework for distributed ledger technology
X.1403	Security guidelines for using distributed ledger technology for decentralized identity management
X.1404	Security assurance for distributed ledger technology
X.1405	Security threats and requirements for digital payment services based on distributed ledger technology
X.1406	Security threats to online voting systems using distributed ledger technology
X.1407	Security requirements for digital integrity proofing service based on distributed ledger technology
X.1408	Security threats and requirements for data access and sharing based on the distributed ledger technology
X.1409	Security services based on distributed ledger technology
X.1410	Security architecture of data sharing management based on the distributed ledger technology
X.1411	Guideline on blockchain as a service (BaaS) security
X.1412	Security requirements for smart contract management based on the distributed ledger technology
X.1450	Guidelines on hybrid authentication and key management mechanisms in the client-server model
X.1451	Risk identification to optimize authentication
X.1452	Guidelines for security services provided by operators
X.1453	Security threats and requirements for video management systems
X.1454	Security measures for location-enabled smart office services
X.1455	Security measures for a smart residential community
X.1470	Security guidelines of web-based online customer service
X.1471	Reference monitor for online analytics services
X.1500	Overview of cybersecurity information exchange
X.1500.1	Procedures for the registration of arcs under the object identifier arc for cybersecurity information exchange
X.1520	Common vulnerabilities and exposures
X.1521	Common vulnerability scoring system
X.1524	Common weakness enumeration
X.1525	Common weakness scoring system
X.1526	Language for the open definition of vulnerabilities and for the assessment of a system state
X.1528	Common platform enumeration
X.1528.1	Common platform enumeration naming
X.1528.2	Common platform enumeration name matching
X.1528.3	Common platform enumeration dictionary
X.1528.4	Common platform enumeration applicability language
X.1541	Incident object description exchange format version 2
X.1542	Session information message exchange format
X.1544	Common attack pattern enumeration and classification
X.1546	Malware attribute enumeration and characterization
X.1550	Access control models for incident exchange networks
X.1570	Discovery mechanisms in the exchange of cybersecurity information
X.1580	Real-time inter-network defence
X.1581	Transport of real-time inter-network defence messages
X.1582	Transport protocols supporting cybersecurity information exchange
X.1600	Security architecture of edge cloud
X.1601	Security framework for cloud computing
X.1602	Security requirements for software as a service application environments
X.1603	Data security requirements for the monitoring service of cloud computing
X.1604	Security requirements of Network as a Service (NaaS) in cloud computing
X.1605	Security requirements of public Infrastructure as a Service (IaaS) in cloud computing
X.1606	Security requirements for communications as a service application environments
X.1631	Information technology - Security techniques - Code of practice for information security controls based on ISO/IEC 27002 for cloud services
X.1641	Guidelines for cloud service customer data security
X.1642	Guidelines for the operational security of cloud computing
X.1643	Security requirements and guidelines for virtualization containers in cloud computing environments
X.1644	Security guidelines for distributed cloud
X.1645	Requirements of network security situational awareness platform for cloud computing
X.1647	Security guidelines for selecting computing methods and resources from Cloud Service Providers
X.1702	Quantum noise random number generator architecture
X.1710	Security framework for quantum key distribution networks
X.1712	Security requirements and measures for quantum key distribution networks - key management
X.1713	Security requirements for the protection of quantum key distribution nodes
X.1714	Key combination and confidential key supply for quantum key distribution networks
X.1715	Security requirements and measures for integration of quantum key distribution network and secure storage network
X.1716	Authentication and authorization in quantum key distribution network (QKDN)
X.1717	Security requirements and measures for quantum key distribution network (QKDN) - control and management
X.1750	Guidelines on security of big data as a service for big data service providers
X.1751	Security guidelines for big data lifecycle management by telecommunication operators
X.1752	Security guidelines for big data infrastructure and platform
X.1770	Technical guidelines for secure multi-party computation
X.1771	Security guidelines for combining de-identified data using trusted third party
X.1811	Security guidelines for applying quantum-safe algorithms in IMT-2020 systems
X.1812	Security framework based on trust relationships for the IMT-2020 ecosystem
X.1813	Security and monitoring requirements for operation of vertical services supporting ultra-reliability and low latency communication (URLLC) in IMT-2020 private networks
X.1814	Security guidelines for IMT-2020 communication system s
X.1815	Security guidelines and requirements for IMT-2020 edge computing services
X.1816	Guidelines and requirements for classifying security capabilities in IMT-2020 network slice
X.1817	Security requirements for 5G messaging service
X.1818	Security controls for operation and maintenance of IMT-2020/5G network systems
X.1819	Security capabilities of network layer for IMT-2020/5G edge computing
X.1820	Security Requirements for Operation of IMT-2020/5G Core Network to Support Vertical Services
X.2011	Security guidelines for digital twin network
X.2012	Security measures for digital twin system of smart cities
X.ImpOSI	OSI Implementers' Guide - Version 1.1
X.Sup1	ITU-T X.135 - Supplement related to some test results from specific national and international portions
X.Sup2	ITU-T X.800-X.849 series - Supplement on security baseline for network operators
X.Sup3	ITU-T X.800-X.849 series - Supplement on guidelines for implementing system and network security
X.Sup4	ITU-T X.290-series - Supplement on generic approach to interoperability testing
X.Sup5	ITU-T X.290 series - Supplement on interoperability testing framework and methodology
X.Sup6	ITU-T X.1240 series - Supplement on countering spam and associated threats
X.Sup7	ITU-T X.1250 series - Supplement on overview of identity management in the context of cybersecurity
X.Sup8	ITU-T X.1205 - Supplement on best practices against botnet threats
X.Sup9	ITU-T X.1205 - Supplement on guidelines for reducing malware in ICT networks
X.Sup10	ITU-T X.1205 - Supplement on usability of network traceback
X.Sup11	ITU-T X.1245 - Supplement on framework based on real-time blocking lists for countering VoIP spam
X.Sup12	ITU-T X.1240 - Supplement on overall aspects of countering mobile messaging spam
X.Sup13	ITU-T X.1051 - Supplement on information security management users' guide for Recommendation ITU-T X.1051
X.Sup14	ITU-T X.1243 - Supplement on a practical reference model for countering e-mail spam using botnet information
X.Sup15	ITU-T X.800-X.849 series - Supplement on guidance for creating a national IP-based public network security centre for developing countries
X.Sup16	ITU-T X.800-X.849 series - Supplement on architectural systems for security controls for preventing fraudulent activities in public carrier networks
X.Sup17	ITU-T X.1143 - Supplement on threats and security objectives for enhanced web-based telecommunication services
X.Sup18	ITU-T X.1205 - Supplement on guidelines for abnormal traffic detection and control on IP-based telecommunication networks
X.Sup19	ITU-T X.1120-X.1139 series - Supplement on security aspects of smartphones
X.Sup20	ITU-T X.1205 - Supplement on framework of security information sharing negotiation
X.Sup21	ITU-T X.1143 - Supplement on security framework for web mashup services
X.Sup22	ITU-T X.1144 - Supplement on enhancements and new features in eXtensible Access Control Markup Language (XACML 3.0)
X.Sup23	ITU-T X.1037 - Supplement on security management guidelines for the implementation of an IPv6 environment in telecommunication organizations
X.Sup24	ITU-T X.1120-X.1139 series - Supplement on a secure application distribution framework for communication devices
X.Sup25	ITU-T X.1231 - Supplement on guidance to assist in countering spam for mobile phone developers
X.Sup26	ITU-T X.1111 - Supplement on security functional architecture for smart grid services using telecommunication networks
X.Sup27	ITU-T X.1054 - Supplement on best practice for governance of information security - Case of Burkina Faso
X.Sup28	ITU-T X.1245 - Supplement on technical measures and mechanisms on countering spoofed calls in the terminating network of voice over long term evolution (VoLTE) This Supplement was replaced on 03/05/2019 to reflect and updated title
X.Sup29	ITU-T X.1242 - Supplement on guidelines on countermeasures against short message service phishing and smishing attacks This Supplement was replaced on 03/05/2019 to reflect and updated title
X.Sup30	ITU-T X.805 - Supplement on security guidelines for mobile virtual network operators This Supplement was replaced on 03/05/2019 to reflect and updated title
X.Sup31	ITU-T X.660 - Supplement on guidelines for using object identifiers for the Internet of things This Supplement was replaced on 03/05/2019 to reflect and updated title
X.Sup32	ITU-T X.1058 - Supplement on code of practice for personally identifiable information (PII) protection for telecommunication organizations This Supplement was replaced on 03/05/2019 to reflect and updated title
X.Sup33	ITU-T X.1231 - Supplement on technical framework for countering telephone service scams This Supplement was replaced on 03/05/2019 to reflect and updated title
X.Sup34	ITU-T X.1051 - Supplement on code of practice for information security controls for telecommunication organizations This Supplement was replaced on 03/05/2019 to reflect and updated title
X.Sup35	ITU-T X.1254 - Supplement on use cases of entity authentication assurance (EAA) framework
X.Sup36	ITU-T X.1051 - Supplement on critical security controls for information and network security management by telecommunication organizations
X.Sup37	ITU-T X.1231 - Supplement on countering spam based on machine learning
X.Sup38	ITU-T X.1152 - Supplement on use cases for contact tracing technologies to prevent spread of infectious diseases
X.Sup39	ITU-T X.1148 - Supplement on requirements for data de-identification assurance
X.Sup40	ITU-T X.1152 - Supplement on use cases for digital COVID-19 certificates
X.Sup41	Supplement to ITU-T X.1254: e-KYC use cases in digital financial services
X.Sup42	Supplement to ITU-T X.1254: Implementation of secure authentication technologies for digital financial services
X.Sup43	Supplement to X.1813 - Security deployment scenarios for cellular vehicle -to-everything (C-V2X) services supporting ultra-reliable and low latency communication (URLLC)