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 | 23,027,456 | 1.01 x 239 | 1 | 300 | |
| British Telecommunications PLC | 21,913,856 | 1.04 x 242 | 5 | 862 | |
| TalkTalk Communications Limited | 8,357,376 | 1.59 x 237 | 2 | 117 | |
| 4 | Sky UK Limited | 7,156,480 | 1.58 x 237 | 3 | 87 |
| 5 | Jisc Services Limited | 6,982,400 | 1.63 x 236 | 1 | 221 |
| 6 | Vodafone Limited | 3,063,040 | 1.13 x 235 | 3 | 54 |
| 7 | COLT Technology Services Group Limited | 1,668,608 | 1.77 x 234 | 3 | 348 |
| 8 | Datacamp Limited | 1,152,768 | 1.17 x 241 | 3 | 4,702 |
| 9 | Hutchison 3G UK Limited | 1,070,080 | 1.14 x 233 | 2 | 348 |
| 10 | Claranet Limited | 909,824 | 1.33 x 237 | 2 | 102 |
| 11 | Wavenet Limited | 848,144 | 1.19 x 236 | 3 | 178 |
| 12 | GCI Network Solutions Limited | 621,568 | 1.25 x 236 | 1 | 224 |
| 13 | Gamma Telecom Holdings Ltd | 616,448 | 1.5 x 236 | 3 | 47 |
| 14 | Liquid Telecommunications Ltd | 552,704 | 1.37 x 235 | 2 | 2,182 |
| 15 | Zen Internet Ltd | 527,616 | 235 | 1 | 38 |
| 16 | Rackspace Ltd. | 526,792 | 1.5 x 233 | 5 | 103 |
| 17 | Glide Student & Residential Limited | 504,064 | 1.56 x 236 | 2 | 318 |
| 18 | IOMART CLOUD SERVICES LIMITED | 425,984 | 1.19 x 236 | 2 | 235 |
| 19 | Clouvider Limited | 385,792 | 1.12 x 238 | 6 | 2,668 |
| 20 | Cityfibre Limited | 360,192 | 1.06 x 236 | 1 | 50 |