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 | 328 | |
| TalkTalk Communications Limited | 24,342,272 | 1.56 x 237 | 5 | 181 | |
| British Telecommunications PLC | 18,468,096 | 1.13 x 242 | 7 | 534 | |
| 4 | EE Limited | 10,512,384 | 236 | 1 | 54 |
| 5 | Sky UK Limited | 7,483,648 | 1.5 x 235 | 2 | 40 |
| 6 | Jisc Services Limited | 7,384,064 | 1.63 x 236 | 1 | 202 |
| 7 | Hutchison 3G UK Limited | 2,015,744 | 1.32 x 232 | 2 | 190 |
| 8 | Vodafone Limited | 1,983,488 | 232 | 7 | 79 |
| 9 | COLT Technology Services Group Limited | 1,377,792 | 1.25 x 234 | 4 | 1,122 |
| 10 | KCOM GROUP LIMITED | 1,290,498 | 1.5 x 235 | 4 | 76 |
| 11 | Claranet Limited | 1,042,944 | 1.56 x 237 | 3 | 154 |
| 12 | M247 Ltd | 1,031,170 | 1.38 x 238 | 2 | 2,541 |
| 13 | Digital Energy Technologies Ltd. | 1,014,272 | 1.39 x 239 | 2 | 1,554 |
| 14 | Zen Internet Ltd | 805,888 | 235 | 1 | 33 |
| 15 | Daisy Communications Ltd | 785,152 | 1.19 x 236 | 4 | 116 |
| 16 | RM Education Ltd | 607,744 | 232 | 1 | 16 |
| 17 | Telefonica UK Limited | 570,368 | 0 | 3 | 151 |
| 18 | Liquid Telecommunications Ltd | 552,704 | 1.16 x 235 | 2 | 383 |
| 19 | MDNX Internet Limited | 551,168 | 232 | 1 | 94 |
| 20 | Gamma Telecom Holdings Ltd | 487,168 | 1.5 x 236 | 1 | 37 |