United Kingdom: IP addresses and networks
United Kingdom holds 138,942,528 public IPv4 addresses — 3.77% of all allocated IPv4 space, which ranks it #4 worldwide. Its address space is administered by RIPE NCC.
It also holds enough IPv6 to cover 1,387,274,519 end-site networks, a figure that says more about how recently its providers deployed IPv6 than about how many people live there.
3,132 autonomous system numbers are registered there, and 2,071 of them currently announce routes on the public internet.
Allocation
- IPv4 addresses
- 138,942,528
- IPv6 end-site networks
- 1,387,274,519
- Share of world IPv4
- 3.77%
- World rank by IPv4
- #4
Network
- Regional registry
- RIPE NCC
- Registered AS numbers
- 3,132
- Networks announcing routes
- 2,071
- Country
- GB
United Kingdom: largest networks
| AS number | Network | IPv4 addresses |
|---|---|---|
| AS2856 | BT-UK-AS BTnet UK Regional network | 13,822,976 |
| AS5089 | NTL | 8,492,032 |
| AS786 | JANET Jisc Services Limited | 6,894,080 |
| AS5607 | BSKYB-BROADBAND-AS | 6,089,728 |
| AS13285 | OPALTELECOM-AS TalkTalk Communications Limited | 3,954,944 |
| AS5378 | Vodafone | 2,531,328 |
| AS6871 | PLUSNET UK Internet Service Provider | 2,097,664 |
| AS8220 | COLT COLT Technology Services Group Limited | 1,489,407 |
Allocation reflects when a country's networks joined the internet rather than its population, and addresses registered here can be routed anywhere in the world. That is one of the reasons IP geolocation is an estimate rather than a fact.
Check your own IP address → All countries
Source: the five regional internet registries' delegated-statistics files and the public IP-to-ASN table. Updated 2026-09-13.