List of the top 20 organizations with the largest IP allocations in United Kingdom
| Rank | Name | IPv4 addresses | IPv6 /64 networks | AS numbers | Prefixes |
|---|---|---|---|---|---|
| Virgin Media Limited | 26,928,984 | 1.01 x 239 | 3 | 330 | |
| TalkTalk Communications Limited | 24,342,272 | 1.56 x 237 | 5 | 181 | |
| British Telecommunications PLC | 18,202,112 | 1.13 x 242 | 6 | 433 | |
| 4 | EE Limited | 10,512,384 | 236 | 1 | 54 |
| 5 | Sky UK Limited | 7,483,648 | 235 | 2 | 32 |
| 6 | Jisc Services Limited | 7,385,088 | 1.63 x 236 | 1 | 206 |
| 7 | Hutchison 3G UK Limited | 2,078,208 | 1.32 x 232 | 2 | 225 |
| 8 | Vodafone Limited | 1,981,440 | 232 | 7 | 77 |
| 9 | KCOM GROUP LIMITED | 1,224,450 | 1.5 x 235 | 4 | 74 |
| 10 | COLT Technology Services Group Limited | 1,213,440 | 234 | 1 | 803 |
| 11 | Claranet Limited | 1,040,896 | 1.31 x 237 | 3 | 152 |
| 12 | M247 Ltd | 990,976 | 1.36 x 238 | 2 | 2,367 |
| 13 | Akamai International B.V. | 933,824 | 232 | 2 | 276 |
| 14 | Zen Internet Ltd | 805,888 | 235 | 1 | 33 |
| 15 | Digital Energy Technologies Ltd. | 803,840 | 1.4 x 239 | 2 | 1,463 |
| 16 | Daisy Communications Ltd | 785,408 | 1.19 x 236 | 4 | 117 |
| 17 | RM Education Ltd | 632,320 | 232 | 1 | 15 |
| 18 | Telefonica UK Limited | 570,880 | 0 | 3 | 153 |
| 19 | Liquid Telecommunications Ltd | 570,629 | 1.16 x 235 | 2 | 458 |
| 20 | MDNX Internet Limited | 551,424 | 232 | 1 | 95 |