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 | 22,900,736 | 1.01 x 239 | 1 | 312 | |
| British Telecommunications PLC | 21,793,536 | 1.03 x 242 | 6 | 765 | |
| TalkTalk Communications Limited | 8,488,448 | 1.59 x 237 | 2 | 113 | |
| 4 | Sky UK Limited | 7,156,480 | 1.58 x 237 | 3 | 87 |
| 5 | Jisc Services Limited | 7,111,424 | 1.63 x 236 | 1 | 222 |
| 6 | Vodafone Limited | 3,063,040 | 1.13 x 235 | 3 | 54 |
| 7 | COLT Technology Services Group Limited | 1,667,072 | 1.77 x 234 | 3 | 342 |
| 8 | Hutchison 3G UK Limited | 992,512 | 1.09 x 233 | 2 | 214 |
| 9 | Datacamp Limited | 943,936 | 1.82 x 240 | 3 | 3,803 |
| 10 | Claranet Limited | 909,568 | 1.33 x 237 | 2 | 101 |
| 11 | Wavenet Limited | 848,400 | 1.19 x 236 | 3 | 172 |
| 12 | GCI Network Solutions Limited | 621,824 | 1.25 x 236 | 1 | 225 |
| 13 | Gamma Telecom Holdings Ltd | 616,448 | 1.5 x 236 | 3 | 47 |
| 14 | Liquid Telecommunications Ltd | 552,192 | 1.37 x 235 | 2 | 2,128 |
| 15 | Zen Internet Ltd | 528,128 | 235 | 1 | 39 |
| 16 | Rackspace Ltd. | 425,672 | 1.5 x 233 | 3 | 85 |
| 17 | IOMART CLOUD SERVICES LIMITED | 425,472 | 1.19 x 236 | 2 | 233 |
| 18 | Clouvider Limited | 367,872 | 1.13 x 238 | 9 | 2,564 |
| 19 | Cityfibre Limited | 360,448 | 1.06 x 236 | 2 | 51 |
| 20 | Telefonica UK Limited | 300,544 | 232 | 3 | 136 |