List of the top 20 organizations with the largest IP allocations in Bulgaria
| Rank | Name | IPv4 addresses | IPv6 /64 networks | AS numbers | Prefixes |
|---|---|---|---|---|---|
| A1 Bulgaria EAD | 1,765,377 | 1.17 x 235 | 7 | 1,640 | |
| Vivacom Bulgaria EAD | 1,552,134 | 1.51 x 233 | 10 | 1,204 | |
| "Cooolbox" AD | 186,880 | 0 | 1 | 127 | |
| 4 | Geodim Ltd. | 83,456 | 0 | 1 | 150 |
| 5 | Bulgarian Research and Education Network Association (BREN) | 75,264 | 232 | 1 | 31 |
| 6 | UltraNET Ltd | 75,008 | 0 | 1 | 192 |
| 7 | Comnet Bulgaria Holding Ltd. | 72,960 | 1.13 x 235 | 2 | 157 |
| 8 | Net-Surf.net Ltd. | 70,407 | 0 | 1 | 181 |
| 9 | Optisprint OOD | 68,608 | 232 | 1 | 141 |
| 10 | HZ Hosting Ltd | 62,976 | 221 | 4 | 224 |
| 11 | Angel Soft OOD | 59,392 | 0 | 1 | 109 |
| 12 | Evolink AD | 57,346 | 233 | 1 | 36 |
| 13 | Digital Systems Ltd | 50,432 | 232 | 1 | 6 |
| 14 | Geo BG Net SPLtd. | 47,872 | 0 | 1 | 141 |
| 15 | "NOVATEL" EOOD | 45,056 | 1.13 x 235 | 1 | 28 |
| 16 | Neterra Ltd. | 42,753 | 232 | 2 | 155 |
| 17 | M SAT Cable EAD | 39,424 | 232 | 1 | 23 |
| 18 | ESCOM Ltd. - Haskovo | 37,377 | 232 | 1 | 148 |
| 19 | Rimex Ltd. | 32,768 | 0 | 1 | 18 |
| 20 | NETGUARD LLC | 32,512 | 232 | 3 | 83 |