IP ranges in the United Kingdom

This page lists the IPv4 address blocks registered to organisations in the United Kingdom and checks single addresses. The basics of IP addresses, masks and subnets are in Networks; the other countries are in IP ranges by country.

The United Kingdom in numbers

The 48 countries here hold 725,908,608 IPv4 addresses; the United Kingdom has 138,643,520 in 9,045 blocks, 19.1% of the total, rank 1 of 48. The next country is Germany with 126,282,368 addresses (17.4%). There are 9,045 blocks: 6,989 allocated (77.3%) and 2,056 assigned (22.7%). The oldest block was delegated in 1983 and the newest in 2026; 2019 is the year with the most new blocks. The largest share of the addresses, 64,923,904 of 138,643,520 (46.8%), came in the 1990s. The same RIPE file lists 2,008 IPv6 prefixes and 3,106 AS numbers for the United Kingdom.

Check an IP address

Type an IPv4 address. The answer comes from the Sypex Geo database on this server; like every geolocation database it can be wrong, especially about the city.

Where the list comes from

IP addresses are handed out by five regional internet registries. For the United Kingdom the registry is RIPE NCC, which publishes every day which address blocks it has delegated to which country. A block registered in the United Kingdom is usually used there, but not always: a company may use its addresses abroad, and a VPN makes any visitor look like someone else.

The table below is the RIPE file of 2026-10-29: 9,045 blocks with 138,643,520 addresses. The largest block holds 16,777,216 addresses and starts at 25.0.0.0.

Get the list yourself

Download the statistics file of RIPE NCC:

curl -s -O https://ftp.ripe.net/pub/stats/ripencc/delegated-ripencc-latest

The first line says when it was made; the sixth field is the date:

head -1 delegated-ripencc-latest

2|ripencc|1793314799|167770|19700101|20261029|+0100

Each later line is one block: registry, country, type, first address, number of addresses, date and status. The IPv4 blocks of the United Kingdom, sorted by first address:

awk -F'|' '$2=="GB" && $3=="ipv4"' delegated-ripencc-latest | sort -t'|' -k1,1V | head -3

ripencc|GB|ipv4|1.186.0.0|65536|20100713|allocated ripencc|GB|ipv4|2.56.84.0|1024|20190313|allocated ripencc|GB|ipv4|2.56.148.0|1024|20190314|allocated

How many blocks, and how many addresses they hold together:

awk -F'|' '$2=="GB" && $3=="ipv4"' delegated-ripencc-latest | wc -l

9045

awk -F'|' '$2=="GB" && $3=="ipv4" {s+=$5} END {print s}' delegated-ripencc-latest

138643520

allocated means RIPE gave the block to a provider (a LIR) to hand out further; assigned means it went to an end user directly.

Who owns a block

The statistics name no owners. The RIPE database does: ask it with whois for any address of a block, and look at the lines netname, descr and org:

whois 25.0.0.1

All IPv4 blocks in the United Kingdom

From the RIPE file of 2026-10-29, sorted by address. The last address is the first one plus the size minus one.