| Name | ITU-R | ITU-T | ITU-D | Categories |
| ALGERIA |
| Algérie Télécom SPA, ALGER | X | X | X | ROA / OPERATOR |
| Autorité de Régulation de la Poste et des Communications Electroniques (ARPCE), ALGER | X | X | X | OTHER ENTITY / REGULATOR |
| AUSTRALIA |
| NBN Corporation Limited, Doclands | | X | | ROA |
| Telstra Limited, MELBOURNE | X | X | | ROA / OPERATOR |
| AUSTRIA |
| A1 Telekom Austria AG, WIEN | X | X | X | ROA / OPERATOR |
| BAHRAIN |
| Bahrain Network (BNET), Hamala | | X | | ROA / OPERATOR |
| BELGIUM |
| Proximus PLC, EVERE HAACHT | X | X | | ROA |
| BOSNIA AND HERZEGOVINA |
| BH Telecom, SARAJEVO | | X | X | ROA / OPERATOR |
| CANADA |
| Bell Canada, MONTREAL | | X | | ROA / OPERATOR |
| Ciena Canada, OTTAWA | | X | | SIO / MANUFACTURER |
| Ericsson Canada, Inc., ST. LAURENT | X | X | | SIO |
| InterDigital Canada Ltee, Montreal | | X | | SIO / MANUFACTURER |
| TELUS Communications Inc., EDMONTON | | X | | ROA |
| Vecima Networks Inc., Victoria | | X | | SIO / MANUFACTURER |
| CHINA |
| Alibaba China Co. Ltd., HANGZHOU | | X | | SIO |
| Ant Group Co., Ltd., Hangzhou | | X | | SIO / SERVICE PROVIDER |
| Asiainfo Technologies (China), Inc., Beijing | | X | | OTHER ENTITY |
| Beijing Baidu Netcom Science Technology Co., Ltd., BEIJING | | X | | ROA |
| Beijing Qihu Keji Co., Ltd., BEIJING | | X | | SIO |
| CAS Quantum Network Co. Ltd., Beijing | | X | | ROA |
| China Information Communication Technologies Group, WUHAN | X | X | | SIO |
| China Mobile Communications Co. Ltd., BEIJING | X | X | | ROA / MOBILE OPERATOR |
| China Satellite Network Group Co., Ltd, Beijing | X | X | | ROA / OPERATOR |
| China Telecommunications Corporation, BEIJING | X | X | X | ROA |
| China Tower Corporation Limited, HAIDIAN DISTRICT, BEIJING | X | X | X | ROA / OPERATOR |
| China Unicom, BEIJING | X | X | X | ROA |
| Chongqing Changan Automobile Co. Ltd., Chongqing | | X | | SIO |
| Guangdong OPPO Mobile Telecommunications Corp., Ltd., DongGuan City | X | X | | SIO |
| Hangzhou Hikvision Digital Technology Co.,Ltd., Hangzhou | | X | | SIO |
| Hengtong Optic-electric Co., Ltd., Suzhou | | X | | SIO |
| Huawei Technologies Co., Ltd., SHENZHEN | X | X | X | SIO |
| Information Science Academy of China Electronics Technology Group Corporation (ISA CETC), BEIJING | | X | | SIO / R&D INSTITUTION |
| Inspur Communications Technology Co., Ltd., Shandong | | X | | ROA |
| Jinan Institute of Quantum Technology | | X | | SIO |
| New H3C Technologies Co., Ltd., Beijing | | X | | SIO |
| Nokia Shanghai Bell Co. Ltd., SHANGHAI | X | X | | SIO |
| QuantumCTek Co., Ltd., Beijing | | X | | SIO |
| State Grid Corporation of China, Beijing | | X | | OTHER ENTITY |
| SZ DJI Technology Co. Ltd., Nanshan District, Shenzhen | | X | | SIO |
| Tencent Technology (Shenzhen) Company Limited, Shenzhen | | X | | ROA |
| Vivo Mobile Communication Co., Ltd., Dongguan | | X | | SIO / MANUFACTURER |
| Zhejiang Dahua Technology Co. Ltd., HANGZHOU | | X | | SIO |
| ZTE Corporation, SHENZHEN, GUANGDONG | X | X | X | SIO |
| COSTA RICA |
| Instituto Costarricense de Electricidad (ICE), SAN JOSÉ | X | X | X | ROA / OPERATOR |
| CUBA |
| Empresa de Telecomunicaciones de Cuba (ETECSA), LA HABANA | X | X | X | ROA |
| CôTE D'IVOIRE |
| Moov Africa Côte d’Ivoire, ABIDJAN | | X | X | ROA |
| EQUATORIAL GUINEA |
| Guinea Ecuatorial de Telecomunicaciones, Sociedad Anonima, A.P. 494 MALABO | | X | | ROA / OPERATOR |
| FINLAND |
| Nokia Corporation, HELSINKI | X | X | X | SIO |
| FRANCE |
| Afnic, Guyancourt | | X | X | OTHER ENTITY |
| Office des Postes et Télécommunications de Nouvelle-Calédonie, NOUMEA CEDEX | | X | | ROA / OPERATOR |
| Orange, PARIS | X | X | X | ROA |
| SAGEMCOM BROADBAND SAS, RUEIL-MALMAISON CÉDEX | | X | | SIO |
| Vantiva Technologies SAS, Paris | | X | | SIO |
| GERMANY |
| Bayernwerk AG, REGENSBURG | | X | | OTHER ENTITY |
| Deutsche Telekom AG, Bonn | X | X | | ROA |
| Deutsche Welle, BONN | | X | | ROA |
| Fraunhofer HHI & IIS, BERLIN | | X | | SIO |
| Huawei Technologies Düsseldorf GmbH, MUNICH | | X | | SIO |
| Robert Bosch GmbH, Stuttgart | X | X | | SIO |
| Rohde & Schwarz GmbH & Co. KG, MÜNCHEN | X | X | X | SIO |
| Vodafone GmbH, DÜSSELDORF | | X | | ROA |
| VOLKSWAGEN AG, Wolfsburg | | X | | OTHER ENTITY |
| GHANA |
| Global Voice Group, Accra | | X | | OTHER ENTITY |
| INDIA |
| Bharti Airtel Limited, GURGAON | X | X | X | ROA / OPERATOR |
| Reliance Jio Infocomm Limited, NAVI MUMBAI | X | X | X | ROA |
| Sterlite Technologies Limited, AURANGABAD | | X | | SIO |
| Telecom Regulatory Authority of India (TRAI), NEW DELHI | X | X | X | OTHER ENTITY / REGULATOR |
| Telecommunications Standards Development Society, India (TSDSI), New Delhi | X | X | | OTHER ENTITY |
| IRAN (ISLAMIC REPUBLIC OF) |
| Mobile Communication Company of Iran, TEHRAN | X | X | | ROA |
| Telecommunication Company of Iran (TCI), TEHRAN | | X | X | ROA |
| ITALY |
| FastWeb S.p.A., MILANO NEXXT | | X | | ROA |
| Intermatica S.p.A., ROME | | X | | OTHER ENTITY |
| Prysmian SpA, MILANO | | X | | SIO |
| STMicroelectronics, AGRATE BRIANZA | | X | | SIO |
| Telecom Italia S.p.A., ROMA | X | X | | ROA |
| JAMAICA |
| Digicel Group, KINGSTON | | X | X | ROA |
| JAPAN |
| Fujitsu Limited, Tokyo | X | X | X | SIO |
| Hitachi, Ltd., Kanagawa-ken | | X | X | SIO |
| KDDI Corporation, TOKYO | X | X | X | ROA |
| Mitsubishi Electric Corporation, TOKYO | X | X | ASSOCIATE SG1 | SIO |
| National Institute of Information and Communications Technology (NICT), TOKYO | X | X | X | SIO |
| NEC Corporation, TOKYO | X | X | X | SIO |
| Nippon Hoso Kyokai (NHK) (Japan Broadcasting Corporation), TOKYO | X | X | | ROA |
| Nippon Telegraph and Telephone Corporation (NTT), TOKYO | X | X | | SIO |
| NTT Communications Corporation, TOKYO | X | X | | ROA |
| NTT Comware Corporation, CHIBA | | X | | SIO |
| NTT DOCOMO, INC., TOKYO | X | X | | ROA |
| Oki Electric Industry Company Ltd. (OKI), TOKYO | X | X | | SIO |
| Panasonic Holdings Corporation, OSAKA | X | X | | SIO |
| Rakuten Mobile, Inc., Tokyo | X | X | | ROA |
| Sharp Corporation, CHIBA | X | X | | SIO |
| SoftBank Corporation, TOKYO | X | X | X | ROA |
| Sony Group Corporation, TOKYO | X | X | | SIO |
| Sony Network Communications Inc., TOKYO | | X | | ROA / SERVICE PROVIDER |
| Sumitomo Electric Industries, Ltd., OSAKA | | X | | SIO |
| The ITU Association of Japan, TOKYO | X | X | X | SIO |
| Toshiba Corporation, MINATO-KU, TOKYO | X | X | | SIO |
| JORDAN |
| Orange Jordan, AMMAN | | X | X | ROA |
| KENYA |
| Safaricom Limited, NAIROBI | X | X | X | ROA |
| KOREA (REP. OF) |
| Electronics and Telecommunications Research Institute (ETRI), DAEJEON | X | X | | SIO |
| Hyundai Motor Company, GYEONGGI-DO | | X | | OTHER ENTITY |
| KT Corporation, SEOUL | X | X | | ROA / OPERATOR |
| LG Uplus, SEOUL | X | X | | ROA |
| Samsung Electronics Co., Ltd., SEOUL | X | X | | SIO |
| SK Telecom, SEOUL | X | X | | ROA |
| KUWAIT |
| Mobile Telecommunications Company K.S.C.P., SAFAT | | X | | ROA |
| LESOTHO |
| Econet Telecom Lesotho, MASERU | | X | | ROA |
| LIBYA |
| Libya Postal Telecommunication and Technology Holding Company (LPTIC), TRIPOLI | X | X | | OTHER ENTITY |
| MEXICO |
| América Móvil, S.A.B. de C.V., CIUDAD DE MÉXICO | X | X | X | ROA / OPERATOR |
| MOROCCO |
| Maroc Télécom - Itissalat Al-Maghrib (IAM), RABAT | X | X | X | ROA |
| NEPAL (REPUBLIC OF) |
| Nepal Telecommunications Authority (NTA), KATHMANDU | X | X | X | OTHER ENTITY / REGULATOR |
| NETHERLANDS (KINGDOM OF THE) |
| Royal KPN N.V., THE HAGUE | X | X | | ROA |
| OMAN |
| Oman Telecommunications Company (Omantel), RUWI | X | X | X | ROA |
| Oman Telecommunications Regulatory Authority (TRA), RUWI | X | X | X | OTHER ENTITY / REGULATOR |
| PERU |
| Organismo Supervisor de Inversión Privada en Telecomunicaciones (OSIPTEL), LIMA | | X | X | OTHER ENTITY / REGULATOR |
| PHILIPPINES |
| DITO Telecommunity Corporation, Taguig City | | X | | ROA / OPERATOR |
| Globe Telecom, Inc., Tagulg | | X | | ROA |
| Philippine Long Distance Telephone Co. (PLDT Inc.), MAKATI CITY | | X | | ROA |
| POLAND |
| Orange Polska S.A., WARSAW | X | X | | ROA |
| Polkomtel Sp. z o.o., WARSAW | X | X | | ROA |
| PORTUGAL |
| MEO - Serviços de Comunicações e Multimédia, S.A., LISBOA | X | X | X | ROA |
| RUSSIAN FEDERATION |
| OJSC 'Multiregional TransitTelecom', MOSCOW | | X | | ROA |
| PJSC «Rostelecom», MOSCOW | | X | | ROA / OPERATOR |
| SAUDI ARABIA |
| Mobily Company, RIYADH | X | X | X | ROA / OPERATOR |
| Saudi Telecom, RIYADH | X | X | X | ROA / OPERATOR |
| SENEGAL |
| Société Nationale des Télécommunications du Sénégal (SONATEL), DAKAR | X | X | X | ROA |
| SINGAPORE |
| Global Esports Federation, Singapore | | X | | OTHER ENTITY |
| SOMALIA |
| Hormuud Telecom Somalia, MOGADISHU | | X | | ROA |
| Somtel, Mogadishu | | X | | ROA / OPERATOR |
| Telesom Company | | X | | ROA / SERVICE PROVIDER |
| SOUTH AFRICA |
| Telkom SA SOC Ltd., CENTURION | X | X | X | ROA |
| Vodacom SA (Pty) Limited, MIDRAND | X | X | X | ROA |
| SPAIN |
| Telefónica S.A., MADRID | X | X | X | ROA |
| SWEDEN |
| Telefon AB - LM Ericsson, STOCKHOLM | X | X | X | SIO |
| Telia Company AB, STOCKHOLM | X | X | | ROA |
| SWITZERLAND |
| HUAWEI Technologies Switzerland AG, Liebefeld | | X | | SIO |
| SEMTECH (International) AG, Rapperswil | | X | | SIO |
| Swisscom SA, BERNE | X | X | X | ROA |
| World's Global Telecom S.A., Lucerne | | X | | SIO / SERVICE PROVIDER |
| SYRIAN ARAB REPUBLIC |
| Syrian Telecom (ST), DAMASCUS | | X | X | ROA / OPERATOR |
| TRINIDAD AND TOBAGO |
| Telecommunications Authority of Trinidad and Tobago (TATT), BARATARIA | X | X | X | OTHER ENTITY / REGULATOR |
| TUNISIA |
| Tunisie Télécom, TUNIS | | X | X | ROA |
| TüRKIYE |
| Turkcell Iletisim Hizmetleri A.S., ISTANBUL | | X | X | ROA / OPERATOR |
| Türk Telekom A.S., ISTANBUL | X | X | X | ROA |
| UNITED ARAB EMIRATES |
| Al Yah Satellite Communications (YahSat), ABU DHABI | X | X | X | ROA |
| Emirates Integrated Telecommunications Company PJSC, DUBAI | X | X | | ROA / OPERATOR |
| Emirates Telecommunication Corporation - Etisalat, DUBAI | X | X | X | ROA |
| UNITED KINGDOM |
| British Telecommunications Plc. (BT Plc), LONDON | X | X | | ROA |
| Broadcom Europe Ltd., Reading | | X | | SIO |
| Cable & Wireless Communications Plc, LONDON | | X | | ROA |
| Eutelsat OneWeb, LONDON | | X | | ROA / SERVICE PROVIDER |
| Netscout, IPSWICH | | X | | SIO |
| RTFM LLP, GLASGOW | | X | | OTHER ENTITY |
| Tata Communications UK Limited, London | | X | | ROA |
| Vodafone Group Services Ltd, NEWBURY | X | X | X | ROA |
| UNITED STATES |
| ADTRAN Holdings Inc., HUNTSVILLE | | X | | SIO |
| Apple Inc., CUPERTINO | X | X | | SIO |
| AT&T, Inc., ATLANTA | X | X | X | ROA |
| Broadcom Corporation, Palo Alto | | X | | SIO |
| Cisco Systems, Inc., SAN JOSE | X | X | X | SIO |
| Corning Incorporated, CORNING | | X | | SIO |
| Dolby Laboratories, SAN FRANCISCO | | X | | SIO |
| Five 9 Inc., San Ramon | | X | | OTHER ENTITY |
| Frontier Communication, Lewisville, TX | X | X | | SIO / SERVICE PROVIDER |
| Globalstar, Inc., MILPITAS | X | X | | ROA |
| IBM, POUGHKEEPSIE | | X | | SIO |
| Infinera Corporation, SUNNYVALE | | X | | SIO |
| Intel Corporation, SANTA CLARA | X | X | X | SIO |
| InterDigital Communications, Inc., CONSHOHOCKEN | X | X | | SIO |
| Juniper Networks, SUNNYVALE | | X | | SIO |
| Lockheed Martin Corporation (LMC), ARLINGTON | X | X | X | ROA |
| Maxlinear Inc, CARLSBAD | | X | | SIO |
| Meta Platforms, Inc., MENLO PARK | X | X | X | SIO |
| Microchip Technology Inc., SAN JOSE | | X | | SIO |
| Microsoft Corporation, REDMOND | X | X | X | SIO / MANUFACTURER |
| Netflix Inc., LOS GATOS | | X | X | SIO / SERVICE PROVIDER |
| Nokia USA, MURRAY HILL | | X | | SIO |
| Qualcomm, Inc., SAN DIEGO | X | X | X | SIO |
| SomosGov Inc., East Brumwick | | X | | OTHER ENTITY |
| Verizon Communication Corporation, Basking Ridge | X | X | X | ROA |
| Viasat, Inc., CARLSBAD | X | X | X | ROA |
| XPERI, LOS GATOS | ASSOCIATE SG6 | X | | SIO / MANUFACTURER |
| Zenaciti Corporation, Beaverton | | X | | SIO |
| 183 Sector Members (ITU-R=91, ITU-T=183, ITU-D=63, any=183; Associates: ITU-R=1, ITU-T=0, ITU-D=1, any=2). |
| Name | ITU-R | ITU-T | ITU-D | Categories |
| African ICT Consumers Network (AICN), COTONOU | | X | X | REGINTORG |
| African Organization for Standardisation, Nairobi | | X | | REGINTORG |
| African Union of Broadcasting, DAKAR | X | X | X | REGINTORG |
| African Union, ADDIS ABABA | X | X | X | REGINTORG |
| American Registry for Internet Numbers (ARIN), Centreville | | X | X | REGINTORG |
| Arab Information and Communication Technology Organization (AICTO), TUNIS | X | X | X | REGINTORG |
| Arab League Educational, Cultural and Scientific Organization (ALECSO), Tunis | | X | X | REGINTORG |
| Arab Private Broadcasting Union, QURTOBA | X | X | X | REGINTORG |
| Arab Regulators Network, ALGIERS | X | X | X | REGINTORG |
| Asia Pacific Network Information Centre, BRISBANE | | X | X | REGINTORG |
| Asia-Pacific Broadcasting Union, KUALA LUMPUR | X | X | X | REGINTORG |
| Asociación de Reguladores Administrador del Foro Latinoamericano de Entes Reguladores de Telecomunicaciones, BOGOTA | X | X | X | REGINTORG |
| Asociación Interamericana de Empresas de Telecomunicaciones, MADRID | X | X | X | REGINTORG |
| Association of Andean Community Telecommunications Enterprises, QUITO | X | X | X | REGINTORG |
| Associação Internacional das Comunicações de Expressão Portuguesa, LISBOA | | X | X | REGINTORG |
| CableLabs, Louisville | | X | | REGINTORG / R&D INSTITUTION |
| Centre for Environment and Development for the Arab Region and Europe, CAIRO | | X | X | REGINTORG |
| Child Helpline International, AMSTERDAM | | X | X | REGINTORG |
| Common Market for Eastern and Southern Africa, Lusaka | X | X | X | REGINTORG |
| Commonwealth ITU Group, LONDON | X | X | X | REGINTORG |
| Commonwealth Telecommunications Organisation, LONDON | X | X | X | REGINTORG |
| Communauté économique des Etats de l'Afrique centrale, LIBREVILLE | X | X | X | REGINTORG |
| Communications Regulators Association of Southern Africa, Gaborone | X | X | X | REGINTORG / REGULATOR |
| Consumers International, LONDON | | X | X | REGINTORG |
| Cooperation Council for the Arab States of the Gulf, MANAMA | X | X | X | REGINTORG |
| Dominic Foundation, Lugano | | X | X | REGINTORG |
| East African Communications Organization, KIGALI | X | X | X | REGINTORG |
| Ecole Supérieure Multinationale des Télécommunications, DAKAR | X | X | X | REGINTORG |
| Economic Community for West African States, ABUJA | X | X | X | REGINTORG |
| Environmental Coalition on Standards, Brussels | | X | | REGINTORG |
| European Broadcasting Union, GRAND-SACONNEX | X | X | X | REGINTORG |
| European Communications Office, COPENHAGEN K | X | X | X | REGINTORG |
| European Competitive Telecommunications Association, BRUSSELS | X | X | X | REGINTORG |
| European Patent Office, MÜNCHEN | | X | | REGINTORG |
| European Telecommunications Network Operators' Association, BRUSSELS | X | X | X | REGINTORG |
| European Telecommunications Standards Institute, SOPHIA ANTIPOLIS CEDEX | X | X | X | REGINTORG |
| European Union, BRUSSELS | X | X | X | REGINTORG |
| Forum of Incident Response and Security Teams (FIRST), MORRISVILLE | | X | X | REGINTORG |
| G3ict - Global Initiative for Inclusive Information and Communication Technologies, ATLANTA | X | X | X | REGINTORG |
| GCC Standardization Organization (GSO), Riyadh | | X | | REGINTORG |
| Global ICT Standardization Forum for India (GISFI), PUNE | | X | | REGINTORG |
| GSM Association, LONDON | X | X | X | REGINTORG |
| IJMA3-The Arab ICT Organization, BEIRUT | | X | X | REGINTORG |
| Institute of Electrical and Electronics Engineers, Inc. (IEEE), Piscataway, NJ | X | X | X | REGINTORG |
| International Air Transport Association, MONTREAL | X | X | X | REGINTORG |
| International Association of IT Lawyers (IAITL), HELLERUP | | X | | REGINTORG |
| International Center for Disability Resources on the Internet (ICDRI), ALEXANDRIA | | X | | REGINTORG |
| International Committee of the Red Cross, GENÈVE | X | X | X | REGINTORG |
| International Electrotechnical Commission, GENÈVE 20 | X | X | X | REGINTORG |
| International Federation for Information Processing (IFIP), LAXENBURG | | X | X | REGINTORG |
| International Maritime Radio Association, LONDON | X | X | | REGINTORG |
| International Mobile Satellite Organization (IMSO), LONDON | X | X | X | REGINTORG |
| International Multilateral Partnership Against Cyber Threats (IMPACT), CYBERJAYA | | X | | REGINTORG |
| International Organization for Standardization, VERNIER, GENEVA | X | X | X | REGINTORG |
| International Telecommunications Satellite Organization, WASHINGTON, DC | X | X | X | REGINTORG |
| International Telecommunications Users Group, WOERDEN | | X | X | REGINTORG |
| Internet Society, GENEVA | | X | X | REGINTORG |
| Internet Systems Consortium, Newmarket | | X | X | REGINTORG |
| ITU-APT Foundation of India (IAFI), NEW DELHI | X | X | X | REGINTORG |
| Mandat International, Geneva | | X | | REGINTORG |
| Open & Agile Smart Cities (OASC), Brussels | | X | | REGINTORG |
| Open Geospatial Consortium, WAYLAND | X | X | X | REGINTORG |
| Organisation Internationale de la Francophonie (OIF), Paris | X | X | X | REGINTORG |
| Pacific Islands Telecommunications Association, SUVA | X | X | X | REGINTORG |
| Personal Connected Health Alliance, CHICAGO | X | X | X | REGINTORG |
| Registro de Direcciones de Internet para América Latina y Caribe - LACNIC, Montevideo | | X | X | REGINTORG |
| Réseaux IP Européens Network Coordination Centre (RIPE NCC), AMSTERDAM | | X | X | REGINTORG |
| Southern Africa Telecentre Networks, LUSAKA | X | X | X | REGINTORG |
| Southern African Development Community, GABORONE | X | X | X | REGINTORG |
| Union Economique et Monétaire Ouest Africaine, OUAGADOUGOU | | X | X | REGINTORG |
| United Kingdom Telecommunications Academy (UKTA), BRACKLEY HATCH | | X | X | REGINTORG |
| URSI-International Union of Radio Science, GENT | X | X | X | REGINTORG |
| West Africa Telecommunications Regulators Assembly, ABUJA | X | X | X | REGINTORG |
| Wireless World Research Forum, Zürich | X | X | X | REGINTORG |
| World Federation of Engineering Organization, Paris | | X | X | REGINTORG |
| 75 Sector Members (ITU-R=44, ITU-T=75, ITU-D=63, any=75). |
