| Belgium |
Belge des Postes et Telecommunications (BIPT) |
| Germany |
Bundesnetzagentur für Elektrizität, Gas, Telekommunikation, Post und Eisenbahnen (BNetzA) |
| France |
Agence Nationale des Fréquence (ANFR) |
| Italy |
L'Autorità per le garanzie nelle communicazioni (AGC) |
| Croatia |
Croatian Instititute of Telecommunications |
| Liechtenstein |
Office for Communications |
| Lithuania |
Lithuanian Telecommunications Regulator |
| Luxembourg |
Institut Luxembourgeois de Régulation (ILR) |
| The Netherlands |
Transport and Water Management Inspectorate Radiocommunications Agency (RDR) |
| Austria |
Bundesministerium für Verkehr, Innovation und Technologie |
| Poland |
Office of Telecommunications Regulation |
| Romania |
General Inspectorate of Communications |
| Switzerland |
Bundesamt für Kommunikation |
| Slovakia |
Telecommunikations Office of the Slovak Republic |
| Slovenia |
Telecommunications and Broadcasting Agency of the Republic of Slovenia |
| Czech Republic |
Czech Telecommunikation Office |
| Hungary |
Nemzeti Hírközlési Hatóság / National Communications Authority, Hungary (NHH) |
