| Rec. | Type of text | SG | Status | Date of approval | Title |
| F.400/X.400 | ISO/IEC 10021-1 | Twin | 17 | In force | 1999-06-18 | Message handling system and service overview |
| F.435 | ISO/IEC 10021-8 | Twin | 17 | In force | 1999-06-18 | Message handling services: Electronic Data Interchange messaging service |
| F.749.5 | ISO 23239-1 | Twin | 16 | In force | 2021-10-29 | Vehicle domain service – General information and use case definitions |
| H.264 (V14) | ISO/IEC 14496-10 | Twin | 16 | In force | 2021-08-22 | Advanced video coding for generic audiovisual services |
| H.264.1 (V6) | ISO/IEC 14496-4 | Twin | 16 | In force | 2016-02-13 | Conformance specification for ITU-T H.264 advanced video coding |
| H.264.2 | ISO/IEC 14496-5 | Twin | 16 | In force | 2016-02-13 | Reference software for ITU-T H.264 advanced video coding |
| H.265 (V9) | ISO/IEC 23008-2 | Twin | 16 | In force | 2023-09-13 | High efficiency video coding |
| H.265.1 | ISO 23008-8 | Twin | 16 | In force | 2018-10-14 | Conformance specification for ITU-T H.265 high efficiency video coding |
| H.265.2 (V3) | ISO 23008-5 | Twin | 16 | In force | 2016-12-22 | Reference software for ITU-T H.265 high efficiency video coding |
| H.266 (V3) | ISO/IEC 23090-3 | Twin | 16 | In force | 2023-09-29 | Versatile video coding |
| H.266.1 (V2) | ISO/IEC 23090-15 | Twin | 16 | In force | 2023-09-13 | Conformance specification for ITU-T H.266 versatile video coding |
| H.266.2 | ISO/IEC 23090-16 | Twin | 16 | In force | 2022-04-29 | Reference software for ITU-T H.266 versatile video coding |
| H.273 (V3) | ISO/IEC 23091-2 | Twin | 16 | In force | 2023-09-29 | Coding-independent code points for video signal type identification |
| H.274 (V3) | ISO/IEC 23002-7 | Twin | 16 | In force | 2023-09-29 | Versatile supplemental enhancement information messages for coded video bitstreams |
| H Suppl. 15 | ISO/IEC TR23008-14:2018 | Twin | 16 | In force | 2017-01-27 | Conversion and coding practices for HDR/WCG Y'CbCr 4:2:0 video with PQ transfer characteristics |
| H Suppl. 17 | ISO/IEC Guide71:2014 | Twin | 16 | In force | 2014-11-28 | Guide for addressing accessibility in standards |
| H Suppl. 18 | ISO/IEC TR23008-15:2018 | Twin | 16 | In force | 2017-10-27 | Signalling, backward compatibility and display adaptation for HDR/WCG video coding |
| H Suppl. 19 | ISO/IEC TR 23091-4 | Twin | 16 | In force | 2021-04-30 | Usage of video signal type code points |
| L.1027 | ETSI EN 303 800-5 | Twin | 5 | In force | 2023-08-13 | Assessment of material efficiency of ICT network infrastructure goods (circular economy) – Server and data storage product disassembly and disassembly instruction |
| L.1070 | ETSI TS 103881 | Twin | 5 | In force | 2023-11-06 | Global digital sustainable product passport opportunities to achieve a circular economy |
| L.1203 | ETSI ES 203 408 | Twin | 5 | In force | 2016-02-22 | Colour and marking identification of up to 400 VDC power distribution for information and communication technology systems |
| L.1205 | ETSI ES 203 474 | Twin | 5 | In force | 2016-12-14 | Interfacing of renewable energy or distributed power sources to up to 400 VDC power feeding systems |
| L.1206 | ETSI TS 103 531 | Twin | 5 | In force | 2017-07-29 | Impact on ICT equipment architecture of multiple AC, -48VDC or up to 400 VDC power inputs |
| L.1207 | ETSI ES 203 726 | Twin | 5 | In force | 2018-05-14 | Progressive migration of a telecommunication/information and communication technology site to 400 VDC sources and distribution |
| L.1210 | ETSI ES 203 700 | Twin | 5 | In force | 2019-12-22 | Sustainable power-feeding solutions for 5G networks |
| L.1220 | ETSI TS 103 553-1 | Twin | 5 | In force | 2017-08-13 | Innovative energy storage technology for stationary use - Part 1: Overview of energy storage |
| L.1221 | ETSI TS 103 553-2 | Twin | 5 | In force | 2018-11-13 | Innovative energy storage technology for stationary use - Part 2: Battery |
| L.1222 | ETSI TS 103 553-3 | Twin | 5 | In force | 2018-05-14 | Innovative energy storage technology for stationary use - Part 3: Supercapacitor technology |
| L.1315 | ETSI ES 203 475 | Twin | 5 | In force | 2017-05-24 | Standardization terms and trends in energy efficiency |
| L.1326 | ETSI ES 203 997 | Twin | 5 | In force | 2023-08-13 | Requirements and use cases of liquid cooling solutions and high energy efficiency solutions for 5G BBU in centralized-RAN mode |
| L.1330 | ETSI ES 203 228 V1.1.1 | Twin | 5 | In force | 2015-03-01 | Energy efficiency measurement and metrics for telecommunication networks |
| L.1331 | ETSI ES 203 228 V1.4.1 | Twin | 5 | In force | 2022-01-13 | Assessment of mobile network energy efficiency |
| L.1361 | ETSI ES 203 539 | Twin | 5 | In force | 2018-11-13 | Measurement method for energy efficiency of network functions virtualization |
| L.1362 | ETSI ES 203 682 | Twin | 5 | In force | 2024-01-13 | Power management capabilities of the future energy telecommunication network nodes – Enhanced interface for power management in network function virtualization environments |
| L.1410 | ETSI ES 203 199 V1.2.1 | Twin | 5 | In force | 2014-12-07 | Methodology for environmental life cycle assessments of information and communication technology goods, networks and services |
| L Suppl. 28 | ETSI TR 103 476 V1.1.1 | Twin | 5 | In force | 2016-10-14 | Circular economy in information and communication technology; definition of approaches, concepts and metrics |
| L Suppl. 36 | ETSI TR 103 542 | Twin | 5 | In force | 2017-11-22 | ITU-T L.1310 – Study on methods and metrics to evaluate energy efficiency for future 5G systems |
| T.44 | ISO/IEC 16485 | Twin | 16 | In force | 2005-01-08 | Mixed Raster Content (MRC) |
| T.50 | ISO 646 | Twin | 16 | In force | 1992-09-18 | International Reference Alphabet (IRA) (Formerly International Alphabet No. 5 or IA5) – Information technology – 7-bit coded character set for information interchange |
| T.171 | ISO/IEC 13522-1 | Twin | 16 | In force | 1996-10-18 | Protocols for interactive audiovisual services: Coded representation of multimedia and hypermedia objects |
| T.172 | ISO/IEC 13522-5 | Twin | 16 | In force | 1998-02-06 | MHEG-5 – Support for base-level interactive applications |
| T.172 (1998) Cor. 1 | ISO/IEC 13522-5:1997/Cor1 | Twin | 16 | In force | 2008-06-13 | |
| T.502 | ISO/IEC ISP10610-1 | Twin | 16 | In force | 1994-11-11 | Document application profile PM-11 for the interchange of simple structure, character content documents in processable and formatted forms |
| T.505 | ISO/IEC ISP11181-1 | Twin | 16 | In force | 1994-11-11 | Document application profile PM-26 for the interchange of enhanced structure, mixed content documents in processable and formatted forms |
| T.506 | ISO/IEC ISP11182-1 | Twin | 16 | In force | 1993-08-31 | Document application profile PM-36 for the interchange of extended document structures and mixed content documents in processable and formatted forms |
| T.701.11 | ISO/IEC 20071-11 | Twin | 16 | In force | 2020-09-29 | Guidance on text alternatives for images |
| T.701.21 | ISO/IEC TS 20071-21:2015 | Twin | 16 | In force | 2022-03-29 | Guidance on audio description |
| T.701.25 | ISO/IEC TS 20071-25:2017 | Twin | 16 | In force | 2022-03-29 | Guidance on the audio presentation of text in videos, including captions, subtitles and other on-screen text |
| T.832 (V4) | ISO/IEC 29199-2 | Twin | 16 | In force | 2019-06-29 | Information technology - JPEG XR image coding system - Image coding specification |
| T.833 | ISO/IEC 29199-3 | Twin | 16 | In force | 2010-09-13 | Information technology – JPEG XR image coding system – Motion JPEG XR |
| T.834 | ISO/IEC 29199-4 | Twin | 16 | In force | 2014-10-14 | Information technology – JPEG XR image coding system – Conformance testing |
| T.835 | ISO/IEC 29199-5 | Twin | 16 | In force | 2016-08-13 | Information technology – JPEG XR image coding system – Reference software |
| T Suppl. 2 | ISO/IEC TR29199-1 | Twin | 16 | In force | 2011-03-25 | ITU-T T.83x-series – Supplement on information technology – JPEG XR image coding system – System architecture |
| V.43 | ISO/IEC TR15294 | Twin | 16 | In force | 1998-02-06 | Data flow control |
| X.218 | ISO/IEC 9066-1 | Twin | 17 | In force | 1993-03-12 | Reliable Transfer: Model and service definition |
| X.219 | ISO/IEC 9072-1 | Twin | 17 | In force | 1988-11-25 | Remote Operations: Model, notation and service definition |
| X.222 | ISO/IEC 11575 | Twin | 17 | In force | 1995-04-10 | Use of X.25 LAPB-compatible Data Link procedures to provide the OSI connection-mode Data Link service |
| X.222 (1995) Amd. 1 | ISO/IEC 11575:1995/Amd1 | Twin | 17 | In force | 1996-10-05 | Frame relay mapping |
| X.223 | ISO/IEC 8878 | Twin | 17 | In force | 1993-11-16 | Use of X.25 to provide the OSI connection-mode Network service for ITU-T applications |
| X.223 (1993) Amd. 1 | ISO/IEC 8878:1992/Amd1 | Twin | 17 | In force | 1996-10-05 | Transit delay and other refinements |
| X.228 | ISO/IEC 9066-2 | Twin | 17 | In force | 1988-11-25 | Reliable Transfer: Protocol specification |
| X.228 (1988) Cor. 1 | ISO/IEC 9066-2:1989/Cor1 | Twin | 17 | In force | 2000-03-31 | |
| X.229 | ISO/IEC 9072-2 | Twin | 17 | In force | 1988-11-25 | Remote Operations: Protocol specification |
| X.264 | ISO/IEC 11570 | Twin | 17 | In force | 1993-11-16 | Transport protocol identification mechanism |
| X.282 | ISO/IEC 10742 | Twin | 17 | In force | 1999-06-18 | Elements of management information related to the OSI Data Link layer |
| X.290 | ISO/IEC 9646-1 | Twin | 11 | In force | 1995-04-10 | OSI conformance testing methodology and framework for protocol Recommendations for ITU-T applications – General concepts |
| X.291 | ISO/IEC 9646-2 | Twin | 11 | In force | 1995-04-10 | OSI conformance testing methodology and framework for protocol Recommendations for ITU-T applications – Abstract test suite specification |
| X.292 | ISO/IEC 9646-3 | Twin | 17 | In force | 2002-05-14 | OSI conformance testing methodology and framework for protocol Recommendations for ITU-T applications – The Tree and Tabular Combined Notation (TTCN) |
| X.293 | ISO/IEC 9646-4 | Twin | 11 | In force | 1995-04-10 | OSI conformance testing methodology and framework for protocol Recommendations for ITU-T applications – Test realization |
| X.294 | ISO/IEC 9646-5 | Twin | 11 | In force | 1995-04-10 | 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 | ISO/IEC 9646-6 | Twin | 11 | In force | 1995-04-10 | OSI conformance testing methodology and framework for protocol Recommendations for ITU-T applications – Protocol profile test specification |
| X.296 | ISO/IEC 9646-7 | Twin | 11 | In force | 1995-11-21 | OSI conformance testing methodology and framework for protocol Recommendations for ITU-T applications – Implementation conformance statements |
| X.481 | ISO/IEC 12062-2 | Twin | 17 | In force | 1999-06-18 | Message handling systems – P2 protocol PICS proforma |
| X.482 | ISO/IEC 10611-3 | Twin | 17 | In force | 1999-06-18 | Message handling systems – P1 Protocol PICS proforma |
| X.483 | ISO/IEC 10611-4 | Twin | 17 | In force | 1999-06-18 | Message handling systems – P3 Protocol PICS proforma |
| X.484 | ISO/IEC 10611-5 | Twin | 17 | In force | 1999-06-18 | Message handling systems – P7 protocol PICS proforma |
| X.486 | ISO/IEC 12063-2 | Twin | 17 | In force | 1999-06-18 | Message handling systems – Pedi protocol PICS proforma |
| X.487 | ISO/IEC 12062-6 | Twin | 17 | In force | 1999-06-18 | Message handling systems – IPM-MS attributes PICS proforma |
| X.488 | ISO/IEC 12063-5 | Twin | 17 | In force | 1999-06-18 | Message handling systems – EDI-MS attributes PICS proforma |
| X.637 | ISO/IEC ISP11188-1 | Twin | 17 | In force | 1996-10-05 | Basic connection-oriented common upper layer requirements |
| X.638 | ISO/IEC ISP11188-3 | Twin | 17 | In force | 1996-10-05 | Minimal OSI facilities to support basic communications applications |
| X.639 | ISO/IEC ISP11188-2 | Twin | 17 | In force | 1996-10-05 | Basic connection-oriented requirements for ROSE-based profiles |
| X.700 | ISO/IEC 7498-4 | Twin | 2 | In force | 1992-09-10 | Management framework for Open Systems Interconnection (OSI) for CCITT applications |
| X.800 | ISO/IEC 7498-2 | Twin | 17 | In force | 1991-03-22 | Security architecture for Open Systems Interconnection for CCITT applications |
| X.800 (1991) Amd. 1 | ISO/IEC 7498-2:1989/Amd1 | Twin | 17 | In force | 1996-10-05 | Layer Two Security Service and Mechanisms for LANs |
| X.860 | ISO/IEC 10026-1 | Twin | 17 | In force | 1997-12-12 | Open Systems Interconnection – Distributed Transaction Processing: Model |
| X.861 | ISO/IEC 10026-2 | Twin | 17 | In force | 1997-12-12 | Open Systems Interconnection – Distributed Transaction Processing: Service definition |
| X.862 | ISO/IEC 10026-3 | Twin | 17 | In force | 1997-12-12 | Open Systems Interconnection – Distributed Transaction Processing: Protocol specification |
| X.1082 | IEC 80000-14 | Twin | 17 | In force | 2007-11-13 | Telebiometrics related to human physiology |
| X.1082 (2007) Amd. 1 | IEC 80000-14:2008/Amd1 | Twin | 17 | In force | 2009-10-29 | Object identifier assignments under the telebiometrics arc |
| X.1082 (2007) Amd. 2 | IEC 80000-14:2008/Amd2 | Twin | 17 | In force | 2010-05-29 | Enhancement to support the ISO/IEC 80000-series |
| X.1277.2 | FIDO UAF 1.2 | Twin | 17 | In force | 2023-04-29 | Universal authentication framework protocol specification |
| X.1278.2 | FIDO CTAP v2.1 | Twin | 17 | In force | 2023-04-29 | Client to authenticator protocol |
| X.1281 | OSIA v6.1.0 | Twin | 17 | In force | 2024-03-01 | APIs for interoperability of identity management systems |
| Z.165.1 | ETSI ES 202789 | Twin | 17 | In force | 2022-10-14 | Testing and Test Control Notation version 3: TTCN-3 extension package: Extended TRI |
