| Andorra |
Servei de Telecomunicaciones d'Andorra |
| Argentina |
Comisión Nacional de Comunicaciones |
| Austria |
Telecom-Control |
| Belgium |
Belgian Institution of Postal Services and Telecommunications (BIPT) |
| Venezuela |
Comisión nacional de Telecomunicaciones |
| Bulgaria |
Communications Regulation Commission(CRC) |
| Brazil |
Agencia Nacional de Telecomunicaçoes (ANATEL) |
| Βραζιλία |
Ministry of Communications |
| France |
Agence Nationale des Fréquences |
| France |
The French Telecommunications Regulatory Authority (ART) |
| France |
Ministry of postal services, telecommunications and space |
| Germany |
Bundesministerium für Wirtschaft (BMWi) |
| Germany |
Regulierungsbehörde für Telekommunikation und Post (RegTP) |
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| Denmark |
Ministry of Research |
| Denmark |
National Telecom Agency |
| Slovak Republic |
Ministry of Transport, Posts and Telecommunications |
| Slovak Republic |
Regulatory Authority |
| El Salvador |
Superintendencia General de Electricidad y Telecomunicaciones |
| Switzerland |
Federal office for communications (BAKOM-OFCOM-UFCOM) |
| Estonia |
Estonian Natioanal Telecommunications Board (SIDEAMET) |
| United States-Government |
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| United States-Federal |
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| United Kingdom |
Office of Telecommunications (OFTEL) ; (OFTEL's numbering change pages) (Numbering Change website) |
| United Kingdom |
| Ireland |
Department of Transport, Energy and Communications |
| Ireland |
Commission for Communications Regulation (ComReg) |
| Iceland |
Post and Telecommunication Administration |
| Spain |
Comisión del Mercado de las Telecomunicaciones (CMT) |
| Italy |
Italian Competition Authority |
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| Canada |
Canadian Radio-television and Telecommunications Commission (CRTC) |
| Colombia |
Ministerio de Comunicaciones |
| Colombia |
Comisión de Regulación de Telecomunicaciones |
| Korea |
Ministry of Information and Communication |
| Cyprus |
Office of the Commissioner of Telecommunications and Postal Regulation (OCTPR) |
| Latvia |
The Latvia Telecommunication State Inspection |
| Belarus |
Ministry of Post and Telecommunications |
| Lithuania |
Lithuanian Telecommunication Regulator |
| Liechtenstein |
Office for Communications |
| Luxembourg |
Institut Luxembourgeois des Télécommunications |
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| Malta |
Malta Communications Authority MCA |
| Morocco |
National Regulation Agency |
| Mexico |
Comisión Federal de Telecomunicaciones (CFT) |
| Mexico |
Secretaria de Comunicaciones y Transportes |
| Norway |
Norwegian Post and Telecommunications Authority (PT) |
| Netherlands |
Ministry of Transport, Public Works and Water Management, Post and Telecommunications Department (HDTP) |
| Netherlands |
The Independent Post and Telecommunications Authority (OPTA) |
| Honduras |
Comisión Nacional de Telecomunicaciones |
| Hungary |
Communication Authority (HIF) |
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| Peru |
Ministerio de Transportes y Comunicaciones, Viviendas y Construcción |
| Peru |
Organismo Supervisor de Inversión Privada en Telecomunicaciones |
| Poland |
Office of Telecommunication and Post Regulations (URTIP) |
| Portugal |
National Communication Authority (ANACOM) |
| Romania |
National Regulatory Authority for Communications(ANRC) |
| Russian Federation |
Ministry of Information Technologies and Communications of the Russian Federation |
| Slovakia |
Telecommunications Office of the Slavak Republic |
| Sweden |
National Post and Telecom Agency (PTS) |
| Turkey |
Telecommunications Authority |
| Czech |
Czech telecomunications Office (CTO) |
| Finland |
Finnish Communications Regulatory Authority (FICORA) |
| Hong Kong |
Office of the Telecommunications Authority (OFTA) |
