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 | 26,920,792 | 1.01 x 239 | 2 | 328 | |
| TalkTalk Communications Limited | 24,342,272 | 1.56 x 237 | 5 | 181 | |
| British Telecommunications PLC | 18,230,528 | 1.13 x 242 | 5 | 422 | |
| 4 | EE Limited | 10,512,384 | 236 | 1 | 54 |
| 5 | Sky UK Limited | 7,483,648 | 235 | 2 | 32 |
| 6 | Jisc Services Limited | 7,383,552 | 1.63 x 236 | 1 | 200 |
| 7 | Vodafone Limited | 1,981,184 | 232 | 7 | 77 |
| 8 | Hutchison 3G UK Limited | 1,939,200 | 1.25 x 232 | 2 | 182 |
| 9 | COLT Technology Services Group Limited | 1,194,240 | 234 | 1 | 798 |
| 10 | KCOM GROUP LIMITED | 1,157,122 | 1.38 x 235 | 4 | 78 |
| 11 | ClaraNET LTD | 1,038,336 | 1.56 x 236 | 3 | 147 |
| 12 | M247 Ltd | 956,160 | 1.23 x 238 | 2 | 2,524 |
| 13 | Akamai International B.V. | 930,240 | 232 | 2 | 258 |
| 14 | Digital Energy Technologies Ltd. | 838,144 | 1.34 x 239 | 2 | 1,476 |
| 15 | Daisy Communications Ltd | 784,896 | 1.19 x 236 | 5 | 116 |
| 16 | Zen Internet Ltd | 675,072 | 235 | 1 | 32 |
| 17 | RM Education Ltd | 632,320 | 232 | 1 | 15 |
| 18 | Liquid Telecommunications Ltd | 560,130 | 1.16 x 235 | 2 | 445 |
| 19 | MDNX Internet Limited | 545,280 | 232 | 1 | 93 |
| 20 | Telefonica UK Limited | 540,160 | 0 | 3 | 148 |