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 | 26,926,592 | 1.01 x 239 | 3 | 337 | |
| TalkTalk Communications Limited | 24,342,272 | 1.56 x 237 | 5 | 181 | |
| British Telecommunications PLC | 18,742,272 | 1.13 x 242 | 7 | 654 | |
| 4 | EE Limited | 10,512,384 | 236 | 1 | 54 |
| 5 | Sky UK Limited | 7,629,312 | 1.5 x 235 | 2 | 48 |
| 6 | Jisc Services Limited | 7,355,136 | 1.63 x 236 | 2 | 209 |
| 7 | Vodafone Limited | 1,656,832 | 232 | 7 | 36 |
| 8 | COLT Technology Services Group Limited | 1,391,360 | 1.5 x 234 | 4 | 1,100 |
| 9 | Digital Energy Technologies Ltd. | 1,322,496 | 1.29 x 239 | 2 | 1,815 |
| 10 | KCOM GROUP LIMITED | 1,165,568 | 1.5 x 235 | 4 | 73 |
| 11 | M247 Ltd | 1,129,732 | 1.53 x 237 | 2 | 2,727 |
| 12 | Claranet Limited | 1,044,224 | 1.56 x 237 | 3 | 152 |
| 13 | Hutchison 3G UK Limited | 1,000,448 | 1.32 x 232 | 2 | 162 |
| 14 | Daisy Corporate Services Trading Ltd | 790,017 | 1.19 x 236 | 3 | 125 |
| 15 | Zen Internet Ltd | 737,024 | 235 | 1 | 31 |
| 16 | RM Education Ltd | 607,744 | 232 | 1 | 16 |
| 17 | Telefonica UK Limited | 571,904 | 0 | 3 | 156 |
| 18 | Liquid Telecommunications Ltd | 561,920 | 1.16 x 235 | 2 | 388 |
| 19 | Gamma Telecom Holdings Ltd | 519,936 | 1.5 x 236 | 1 | 38 |
| 20 | TELECITYGROUP INTERNATIONAL LIMITED | 463,360 | 1.51 x 236 | 2 | 254 |