United Kingdom holds 138,752,000 IPv4 addresses from APNIC, ARIN and RIPE NCC.
Regional registries have allocated 138,752,000 IPv4 addresses in 9,122 blocks, 2,036 IPv6 blocks and 3,142 network numbers to organisations in United Kingdom, the first on 12 May 1983. By DB-IP’s count the largest network here is Microsoft Corporation (AS8075).
Registered here vs used here
The RIR count is what was allocated to organisations registered in United Kingdom; DB-IP’s count is where it estimates addresses are used. DB-IP places 7,812,481 fewer IPv4 addresses in United Kingdom than were allocated here: some of those blocks are used abroad, which is a common reason databases disagree about a country.
Largest networks by IPv4 space in United Kingdom
IP Geolocation by DB-IP (ASN Lite × Country Lite, CC BY 4.0).
Allocations per year
Delegation records per year (IPv4 blocks + IPv6 blocks + ASN records) still current in the RIR files. Last 12 years shown.
Download the ranges
Every IPv4 and IPv6 range DB-IP Country Lite places in United Kingdom, as CSV. The file carries DB-IP’s attribution, which you must keep if you republish it.
Sources
- NRO RIR delegated-extended statistics · checked 6 Nov 2026
- DB-IP IP to Country Lite (CC BY 4.0) · checked 3 Nov 2026