AS25135

AS25135 is a Vodafone UK mobile/packet-core eyeball ASN, registered under RIPE to Vodafone Limited in Newbury, with the descriptive name "Vodafone UK Packet Backbone Network." It is a small, leaf-like announcement — only around 25–28 IPv4 prefixes and a single IPv6 prefix (~33,792 addresses) serving an estimated ~907K users — and it sits behind the larger Vodafone Limited ASN AS5378 as its provider, with CAIDA seeing it as a pure leaf (one provider, no customers or peers of its own). For triage, this is UK mobile-data space: heavy carrier-grade NAT means a single IP maps to many handsets and subscribers at once, so per-IP attribution is unreliable and behavior should be tied to subscriber sessions rather than to Vodafone. It is worth remembering that Vodafone runs several distinct ASNs, so this number is only one slice of the operator's UK footprint and should be related to its siblings rather than treated as the whole. The PeeringDB record is minimal and was last updated in 2022, so interconnection details are sparse.

Operator

Vodafone Limited (RIPE org ORG-VI6-RIPE, "The Connection," Newbury, UK) [Confirmed] — RIPE WHOIS

Country / RIR

GB, RIPE [Confirmed] — RIPE WHOIS

Allocated

2002-08-02 [Confirmed] — bgp.tools

Org status

active; part of Vodafone Group Plc — vodafone.co.uk

Security/abuse context

no notable public abuse-campaign attribution to AS25135 found as of 2026-06-06; mobile CGNAT shared-IP caveat dominant — bgp.he.net

Network & routing

Network type

mobile-carrier + ISP-eyeball (PeeringDB "Eyeball") [Confirmed]

Size

~25–28 IPv4 prefixes, 1 IPv6 (~33,792 addrs); ~907K users (APNIC/Cloudflare) — bgp.he.net / bgp.tools (2026-06)

Routing/peering

upstream AS5378 (Vodafone Limited); historically AS2830 / AS3561 in RIPE import lines; IX presence / peering policy not disclosed (PeeringDB minimal, last updated 2022); some bogons announced, ROA coverage unclear — bgp.he.net

Notable usage

Vodafone UK mobile/packet-core eyeball ASN — vodafone.co.uk

Related ASNs

AS5378 (Vodafone Limited, the larger UK ASN and AS25135's provider), AS1273 (Vodafone Group / ex-Cable & Wireless), AS3209 (Vodafone Germany)

Analyst note

UK mobile-data space; heavy CGNAT means a single IP maps to many handsets/subscribers — attribute behavior to subscriber sessions, not Vodafone. One of several Vodafone ASNs; pivot via siblings.