Autonomous system
AS2856 BT-UK-AS BTnet UK Regional network
Residential DROP-listed space RIPE
Summary
BT (British Telecom)
isp eyeball backbone
BT's UK network (BT-UK-AS, BTnet) — the incumbent British telecom's internet backbone and access network.
What it's used for
- Consumer and business broadband across the UK, plus BTnet leased-line/business internet and a national backbone.
Notable
- A major "eyeball" network; BT's Openreach access infrastructure underpins much of UK broadband, including lines resold by other ISPs.
Interesting
- As the UK's former state monopoly, BT's network is the historic spine of British telecommunications, now carrying everything from home fibre to enterprise WANs.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 1 exchange in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| LINX LON1 | London, United Kingdom | 195.66.224.10 |
Transit providers
11 upstream, 148 downstream and 185 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 546 prefixes · 13.85M addresses IPv6 5 prefixes
| Country | Name | Prefixes |
|---|---|---|
| GB | United Kingdom | 551 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS2856- Registry name
- BT-UK-AS
- Registrant
- BTNET-INFRA-MNT
- Abuse contact
- abuse@bt.com
- Registered
- 2002-08-30
- Last changed
- 2026-07-21
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 71% valid · 390 valid, 157 with no ROA 3 RPKI-invalid
- ROAs
- 481 authorising AS2856
- ASPA
- no ASPA record
- IRR
- 98% registered · 541 of 550 announcements 4 other origin
- Route objects
- 846 naming AS2856
Reputation
Classification and threat
Residential Fixed-line consumer ISP. Addresses here are homes.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
1 DROP match Announced space overlapping the DROP prefix list.
| Announced | DROP entry | Record |
|---|---|---|
| 188.172.160.0/20 | 188.172.160.0/20 | SBL308891 |
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 440 networks and 1,773 prefixes, as published 2026-10-13. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere