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 | 1,764,353 | 1.19 x 235 | 7 | 1,644 | |
| Vivacom Bulgaria EAD | 1,549,830 | 1.51 x 233 | 9 | 1,196 | |
| "Cooolbox" AD | 185,344 | 0 | 1 | 121 | |
| 4 | Bulgarian Research and Education Network Association (BREN) | 91,392 | 232 | 1 | 62 |
| 5 | Geodim Ltd. | 89,344 | 0 | 1 | 153 |
| 6 | UltraNET Ltd | 75,264 | 0 | 1 | 193 |
| 7 | Comnet Bulgaria Holding Ltd. | 72,960 | 1.13 x 235 | 2 | 157 |
| 8 | Net-Surf.net Ltd. | 71,431 | 0 | 1 | 184 |
| 9 | Optisprint OOD | 68,352 | 232 | 1 | 140 |
| 10 | HZ Hosting Ltd | 67,584 | 221 | 4 | 225 |
| 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. | 48,128 | 0 | 1 | 142 |
| 15 | "NOVATEL" EOOD | 45,568 | 1.13 x 235 | 1 | 29 |
| 16 | Cifrova Kabelna Korporacia EOOD | 44,288 | 0 | 2 | 15 |
| 17 | Neterra Ltd. | 43,521 | 232 | 3 | 158 |
| 18 | M SAT Cable EAD | 39,424 | 232 | 1 | 23 |
| 19 | ESCOM Ltd. - Haskovo | 37,376 | 232 | 1 | 147 |
| 20 | Rimex Ltd. | 32,768 | 0 | 1 | 18 |