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 | 24,738,304 | 1.01 x 239 | 1 | 323 | |
| British Telecommunications PLC | 20,489,000 | 1.02 x 242 | 6 | 630 | |
| TalkTalk Communications Limited | 11,896,320 | 1.59 x 237 | 5 | 138 | |
| 4 | Sky UK Limited | 8,466,688 | 1.58 x 237 | 3 | 97 |
| 5 | RIPE Network Coordination Centre | 7,219,200 | 1.63 x 236 | 1 | 202 |
| 6 | Vodafone Limited | 3,062,016 | 1.13 x 235 | 3 | 52 |
| 7 | COLT Technology Services Group Limited | 1,673,728 | 1.77 x 234 | 3 | 349 |
| 8 | Claranet Limited | 1,040,896 | 1.59 x 237 | 2 | 113 |
| 9 | Hutchison 3G UK Limited | 1,019,904 | 1.68 x 232 | 2 | 224 |
| 10 | Datacamp Limited | 771,874 | 1.2 x 238 | 3 | 2,783 |
| 11 | Daisy Corporate Services Trading Ltd | 755,968 | 1.19 x 236 | 2 | 108 |
| 12 | GCI Network Solutions Limited | 648,192 | 1.25 x 236 | 1 | 252 |
| 13 | Gamma Telecom Holdings Ltd | 584,248 | 1.5 x 236 | 1 | 81 |
| 14 | Liquid Telecommunications Ltd | 547,072 | 1.37 x 235 | 2 | 2,102 |
| 15 | Zen Internet Ltd | 531,200 | 235 | 1 | 38 |
| 16 | IOMART CLOUD SERVICES LIMITED | 429,568 | 1.19 x 236 | 2 | 245 |
| 17 | Rackspace Ltd. | 424,904 | 1.5 x 233 | 3 | 83 |
| 18 | Clouvider Limited | 403,200 | 1.14 x 238 | 4 | 2,568 |
| 19 | Cityfibre Limited | 361,216 | 1.06 x 236 | 2 | 54 |
| 20 | Telefonica UK Limited | 296,960 | 220 | 3 | 114 |