| Name | ITU-R | ITU-T | ITU-D | Categories |
| Ministry of Transport and Infrastructure, ANKARA | MINISTRY | |||
| Information and Communication Technologies Authority (BTK), ÇANKAYA / ANKARA | ADMIN / REGULATOR | |||
| Plan S Uydu ve Uzay Teknolojileri Anonim Şirketi, Ankara | ASSOCIATE SG4 | SIO | ||
| Sigma Telecom (Sigma Telekom ve Haberlesme Tic. Ltd.), Istanbul | X | ROA | ||
| TT Mobil İletişim Hizmetleri AŞ, ISTANBUL | X | ROA / OPERATOR | ||
| Turkcell Iletisim Hizmetleri A.S., ISTANBUL | X | X | ROA / OPERATOR | |
| TURKSAT Uydu Haberlesme Kablo TV ve isletme A.S., ANKARA | X | ROA | ||
| Türk Telekom A.S., ISTANBUL | X | X | X | ROA |
Academia
| Name | Category |
| Kadir Has University, Istanbul | UNIVERS,RSRCH |