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 | 23,503,912 | 1.02 x 242 | 6 | 699 | |
| Virgin Media Limited | 22,970,624 | 1.01 x 239 | 1 | 315 | |
| Sky UK Limited | 8,466,944 | 1.58 x 237 | 3 | 98 | |
| 4 | TalkTalk Communications Limited | 7,702,016 | 1.59 x 237 | 2 | 107 |
| 5 | Jisc Services Limited | 7,204,864 | 1.63 x 236 | 1 | 222 |
| 6 | Vodafone Limited | 3,062,016 | 1.13 x 235 | 3 | 52 |
| 7 | COLT Technology Services Group Limited | 1,664,256 | 1.77 x 234 | 3 | 337 |
| 8 | Claranet Limited | 993,280 | 1.84 x 237 | 2 | 116 |
| 9 | Hutchison 3G UK Limited | 961,280 | 1.09 x 233 | 2 | 212 |
| 10 | Datacamp Limited | 852,496 | 1.09 x 240 | 3 | 3,267 |
| 11 | Wavenet Limited | 848,144 | 1.19 x 236 | 4 | 174 |
| 12 | GCI Network Solutions Limited | 635,904 | 1.25 x 236 | 1 | 217 |
| 13 | Gamma Telecom Holdings Ltd | 615,168 | 1.5 x 236 | 2 | 42 |
| 14 | Liquid Telecommunications Ltd | 545,280 | 1.37 x 235 | 2 | 2,083 |
| 15 | Zen Internet Ltd | 528,128 | 235 | 1 | 39 |
| 16 | IOMART CLOUD SERVICES LIMITED | 429,312 | 1.19 x 236 | 2 | 244 |
| 17 | Rackspace Ltd. | 425,672 | 1.5 x 233 | 3 | 85 |
| 18 | Clouvider Limited | 388,352 | 1.14 x 238 | 9 | 2,648 |
| 19 | Cityfibre Limited | 360,448 | 1.06 x 236 | 2 | 51 |
| 20 | UK-2 Limited | 303,371 | 1.27 x 231 | 1 | 782 |