| Rank | Name | IPv4 addresses | IPv6 /64 networks | AS numbers | Prefixes |
|---|---|---|---|---|---|
| RCS & RDS SA | 2,102,112 | 1.6 x 236 | 5 | 163 | |
| Orange Romania S.A. | 1,984,512 | 1.04 x 233 | 2 | 180 | |
| Vodafone Romania S.A. | 1,928,448 | 1.03 x 238 | 1 | 379 | |
| 4 | M247 Europe SRL | 1,344,007 | 1.97 x 237 | 2 | 4,183 |
| 5 | NEXTGEN COMMUNICATIONS SRL | 314,880 | 0 | 1 | 396 |
| 6 | GTS Telecom SRL | 110,848 | 1.25 x 235 | 4 | 141 |
| 7 | Agentia de Administrare a Retelei Nationale de Informatica pentru Educatie si C | 108,800 | 235 | 1 | 100 |
| 8 | Institutul National de Cercetare-Dezvoltare in informatica - ICI Bucuresti | 106,752 | 232 | 1 | 32 |
| 9 | TELEKOM ROMANIA MOBILE COMMUNICATIONS S.A. | 76,288 | 0 | 1 | 19 |
| 10 | iNES GROUP SRL | 60,416 | 232 | 1 | 20 |
| 11 | Prime Telecom srl | 59,648 | 218 | 1 | 111 |
| 12 | Cyber_Folks SRL | 54,784 | 0 | 1 | 103 |
| 13 | Euroweb Romania S.R.L. | 54,272 | 1.5 x 232 | 1 | 55 |
| 14 | S.C. GVM SISTEM 2003 S.R.L. | 42,752 | 217 | 2 | 20 |
| 15 | S.N. Radiocomunicatii S.A. | 30,976 | 232 | 1 | 97 |
| 16 | SC TECHNOLOGICAL SRL | 30,720 | 0 | 5 | 43 |
| 17 | TV SAT 2002 SRL | 27,392 | 216 | 1 | 42 |
| 18 | Serviciul de Telecomunicatii Speciale | 24,576 | 235 | 2 | 51 |
| 19 | MEDIA SAT SRL | 21,504 | 217 | 1 | 31 |
| 20 | EVOBITS Information Technology SRL | 20,736 | 0 | 1 | 12 |