AS35228 is O2 UK’s mobile network.
AS35228 belongs to Telefonica UK Limited. DB-IP Lite attributes 201,728 IPv4 addresses in 13 ranges and 1 IPv6 ranges to it, all or nearly all of the IPv4 space in United Kingdom. The number is registered with RIPE NCC in United Kingdom on 28 Jun 2005.
Does it publish a geofeed?
Not for the range we sampled (87.194.0.0 – 87.194.255.255): its registry record, and the record above it, link no RFC 8805 geofeed (checked 2 Nov 2026). Without one, location databases have to estimate where these addresses are used, which is a common reason customers of O2 UK see the wrong city. Customers can ask O2 UK to publish one; the evidence report drafts that request.
Shared addresses (CGNAT)
O2 UK hasn’t been documented as using carrier-grade NAT in a source we could check. To see whether your own connection is behind it, compare your router’s address on the CGNAT check.
IPv6
DB-IP lists 1 IPv6 ranges for AS35228, so customers can get IPv6 addresses, which databases place separately from IPv4.
Where its IPv4 space is used, according to DB-IP
Share of the network’s IPv4 addresses by DB-IP Country Lite. IP Geolocation by DB-IP.
IP ranges
IP Geolocation by DB-IP, ASN Lite, CC BY 4.0.
Using an address from this network? See which sources agree on where it is.
Sources
- DB-IP IP to ASN Lite (CC BY 4.0) · checked 3 Nov 2026
- NRO RIR delegated-extended statistics · checked 5 Nov 2026