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 | 1,767,936 | 1.21 x 235 | 7 | 1,658 | |
| Vivacom Bulgaria EAD | 1,550,851 | 1.51 x 233 | 9 | 1,295 | |
| "Cooolbox" AD | 186,368 | 0 | 1 | 122 | |
| 4 | Bulgarian Research and Education Network Association (BREN) | 91,648 | 232 | 1 | 63 |
| 5 | Geodim Ltd. | 89,344 | 0 | 1 | 153 |
| 6 | HZ Hosting Ltd | 77,568 | 221 | 4 | 251 |
| 7 | UltraNET Ltd | 75,776 | 0 | 1 | 195 |
| 8 | Comnet Bulgaria Holding Ltd. | 72,960 | 1.13 x 235 | 2 | 157 |
| 9 | Net-Surf.net Ltd. | 71,431 | 0 | 1 | 184 |
| 10 | Angel Soft OOD | 59,392 | 0 | 1 | 109 |
| 11 | Evolink EAD | 57,858 | 233 | 1 | 38 |
| 12 | Digital Systems Ltd | 50,432 | 232 | 1 | 6 |
| 13 | Geo BG Net SPLtd. | 48,128 | 0 | 1 | 142 |
| 14 | "NOVATEL" EOOD | 45,568 | 1.13 x 235 | 1 | 29 |
| 15 | Cifrova Kabelna Korporacia EOOD | 44,288 | 232 | 2 | 16 |
| 16 | Neterra Ltd. | 43,777 | 232 | 3 | 159 |
| 17 | M SAT Cable EAD | 39,424 | 232 | 1 | 23 |
| 18 | ESCOM Ltd. - Haskovo | 37,121 | 232 | 1 | 147 |
| 19 | Optisprint OOD | 35,072 | 232 | 1 | 139 |
| 20 | Rimex Ltd. | 32,768 | 0 | 1 | 18 |