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 | 24,051,968 | 1.01 x 239 | 1 | 316 | |
| British Telecommunications PLC | 20,473,384 | 1.02 x 242 | 7 | 655 | |
| TalkTalk Communications Limited | 8,488,448 | 1.59 x 237 | 2 | 113 | |
| 4 | Sky UK Limited | 8,466,688 | 1.58 x 237 | 3 | 97 |
| 5 | Jisc Services Limited | 7,270,656 | 1.63 x 236 | 1 | 224 |
| 6 | Vodafone Limited | 3,062,016 | 1.13 x 235 | 3 | 52 |
| 7 | COLT Technology Services Group Limited | 1,665,024 | 1.77 x 234 | 3 | 339 |
| 8 | Claranet Limited | 993,536 | 1.84 x 237 | 2 | 117 |
| 9 | Hutchison 3G UK Limited | 919,296 | 1.68 x 232 | 2 | 199 |
| 10 | Datacamp Limited | 857,616 | 1.74 x 239 | 3 | 3,164 |
| 11 | Wavenet Limited | 848,144 | 1.19 x 236 | 4 | 174 |
| 12 | GCI Network Solutions Limited | 637,184 | 1.25 x 236 | 1 | 219 |
| 13 | Gamma Telecom Holdings Ltd | 582,144 | 1.5 x 236 | 2 | 40 |
| 14 | Liquid Telecommunications Ltd | 548,096 | 1.24 x 235 | 2 | 2,088 |
| 15 | Zen Internet Ltd | 536,320 | 235 | 1 | 40 |
| 16 | IOMART CLOUD SERVICES LIMITED | 429,568 | 1.19 x 236 | 2 | 245 |
| 17 | Rackspace Ltd. | 425,672 | 1.5 x 233 | 3 | 85 |
| 18 | Clouvider Limited | 389,632 | 1.14 x 238 | 9 | 2,647 |
| 19 | Cityfibre Limited | 360,704 | 1.06 x 236 | 2 | 52 |
| 20 | Telefonica UK Limited | 299,008 | 1.25 x 220 | 3 | 120 |