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 | 20,462,888 | 1.02 x 242 | 6 | 606 | |
| TalkTalk Communications Limited | 11,896,320 | 1.59 x 237 | 5 | 138 | |
| 4 | Sky UK Limited | 8,466,176 | 1.58 x 237 | 3 | 95 |
| 5 | RIPE Network Coordination Centre | 7,218,944 | 1.63 x 236 | 1 | 201 |
| 6 | Vodafone Limited | 3,062,016 | 1.13 x 235 | 3 | 52 |
| 7 | COLT Technology Services Group Limited | 1,673,472 | 1.77 x 234 | 3 | 348 |
| 8 | Claranet Limited | 1,040,896 | 1.59 x 237 | 2 | 113 |
| 9 | Hutchison 3G UK Limited | 1,019,904 | 1.67 x 232 | 2 | 223 |
| 10 | Daisy Corporate Services Trading Ltd | 755,968 | 1.19 x 236 | 2 | 108 |
| 11 | Datacamp Limited | 727,842 | 1.17 x 238 | 3 | 2,688 |
| 12 | GCI Network Solutions Limited | 647,424 | 1.25 x 236 | 1 | 249 |
| 13 | Gamma Telecom Holdings Ltd | 584,248 | 1.5 x 236 | 1 | 81 |
| 14 | Liquid Telecommunications Ltd | 545,792 | 1.37 x 235 | 2 | 2,101 |
| 15 | Zen Internet Ltd | 531,200 | 235 | 1 | 38 |
| 16 | IOMART CLOUD SERVICES LIMITED | 429,312 | 1.19 x 236 | 2 | 244 |
| 17 | Rackspace Ltd. | 425,416 | 1.5 x 233 | 3 | 85 |
| 18 | Clouvider Limited | 401,152 | 1.14 x 238 | 4 | 2,557 |
| 19 | Cityfibre Limited | 361,216 | 1.06 x 236 | 2 | 54 |
| 20 | Telefonica UK Limited | 296,960 | 220 | 3 | 114 |