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 | 27,191,384 | 1.01 x 239 | 3 | 330 | |
| TalkTalk Communications Limited | 24,350,464 | 1.56 x 237 | 5 | 182 | |
| British Telecommunications PLC | 19,788,800 | 1.13 x 242 | 7 | 637 | |
| 4 | EE Limited | 10,512,384 | 236 | 1 | 54 |
| 5 | Sky UK Limited | 8,794,368 | 1.5 x 235 | 2 | 45 |
| 6 | Jisc Services Limited | 7,388,160 | 1.63 x 236 | 2 | 210 |
| 7 | Hutchison 3G UK Limited | 2,566,144 | 1.33 x 232 | 2 | 212 |
| 8 | Vodafone Limited | 1,999,360 | 232 | 7 | 80 |
| 9 | COLT Technology Services Group Limited | 1,377,536 | 1.25 x 234 | 4 | 1,104 |
| 10 | Digital Energy Technologies Ltd. | 1,371,648 | 1.34 x 239 | 2 | 1,742 |
| 11 | KCOM GROUP LIMITED | 1,354,242 | 1.5 x 235 | 4 | 80 |
| 12 | M247 Ltd | 1,097,475 | 1.75 x 238 | 2 | 2,645 |
| 13 | Claranet Limited | 1,044,992 | 1.56 x 237 | 3 | 155 |
| 14 | Zen Internet Ltd | 806,912 | 235 | 1 | 34 |
| 15 | Daisy Communications Ltd | 784,640 | 1.19 x 236 | 4 | 120 |
| 16 | RM Education Ltd | 607,744 | 232 | 1 | 16 |
| 17 | Telefonica UK Limited | 571,392 | 0 | 3 | 154 |
| 18 | Liquid Telecommunications Ltd | 550,656 | 1.16 x 235 | 2 | 380 |
| 19 | Gamma Telecom Holdings Ltd | 519,936 | 1.5 x 236 | 1 | 38 |
| 20 | TELECITYGROUP INTERNATIONAL LIMITED | 467,456 | 1.51 x 236 | 2 | 254 |