List of the top 20 organizations with the largest IP allocations in United Kingdom
| Rank | Name | IPv4 addresses | IPv6 /64 networks | AS numbers | Prefixes |
|---|---|---|---|---|---|
| British Telecommunications PLC | 23,549,480 | 1.03 x 242 | 6 | 709 | |
| Virgin Media Limited | 23,036,160 | 1.01 x 239 | 1 | 317 | |
| TalkTalk Communications Limited | 8,488,448 | 1.59 x 237 | 2 | 113 | |
| 4 | Jisc Services Limited | 7,234,816 | 1.63 x 236 | 1 | 222 |
| 5 | Sky UK Limited | 7,156,480 | 1.58 x 237 | 3 | 87 |
| 6 | Vodafone Limited | 3,063,040 | 1.13 x 235 | 3 | 54 |
| 7 | COLT Technology Services Group Limited | 1,666,048 | 1.77 x 234 | 3 | 341 |
| 8 | Claranet Limited | 993,536 | 1.59 x 237 | 2 | 115 |
| 9 | Hutchison 3G UK Limited | 987,392 | 1.09 x 233 | 2 | 213 |
| 10 | Datacamp Limited | 868,672 | 1.21 x 240 | 3 | 3,411 |
| 11 | Wavenet Limited | 847,888 | 1.19 x 236 | 4 | 173 |
| 12 | GCI Network Solutions Limited | 622,080 | 1.25 x 236 | 1 | 226 |
| 13 | Gamma Telecom Holdings Ltd | 615,936 | 1.5 x 236 | 3 | 45 |
| 14 | Liquid Telecommunications Ltd | 549,376 | 1.37 x 235 | 2 | 2,090 |
| 15 | Zen Internet Ltd | 528,128 | 235 | 1 | 39 |
| 16 | IOMART CLOUD SERVICES LIMITED | 428,800 | 1.19 x 236 | 2 | 242 |
| 17 | Rackspace Ltd. | 425,672 | 1.5 x 233 | 3 | 85 |
| 18 | Clouvider Limited | 382,720 | 1.14 x 238 | 7 | 2,631 |
| 19 | Cityfibre Limited | 360,448 | 1.06 x 236 | 2 | 51 |
| 20 | Telefonica UK Limited | 300,544 | 232 | 3 | 133 |