Autonomous system profile

Review registration details, announced prefixes, network relationships and historical snapshots.

AS2856

Announcement observedRIPE NCC

BT-UK-AS British Telecommunications Limited · BT-UK-AS

This profile is assembled from CHA.LA's normalized registration, routing and observation snapshots.

Last active10/17/2026, 02:40:13Snapshot expired

View network topology RDAP registration

ASN: AS2856
Registration country: United Kingdom
Name: BT-UK-AS British Telecommunications Limited
Abbreviation: BT-UK-AS
Registration date: 8/30/2002, 11:12:47
Status: Announcement observed
RIR: RIPE NCC

Network relationships and announced prefixes

ASN / prefix	Description / organization	Geographic scope	First seen	Last active	IPv4	IPv6	Status
109.144.0.0/12BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
109.180.0.0/15BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
109.205.158.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
109.249.0.0/16BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
132.146.0.0/16BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
132.153.244.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
132.153.245.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
132.153.246.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
132.153.247.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
132.153.248.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
132.153.249.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
132.153.250.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
132.153.251.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
132.153.252.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
132.153.253.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
132.153.254.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
132.153.3.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
132.244.79.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
138.108.94.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
142.205.162.0/23BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
143.223.132.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
144.177.74.0/23BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
144.87.0.0/20BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/20/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
144.87.0.0/21BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	9/19/2026, 16:00:00	✓	×	Historical record
144.87.128.0/17BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/20/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
144.87.128.0/18BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	9/19/2026, 16:00:00	✓	×	Historical record
144.87.16.0/20BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
144.87.24.0/21BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
144.87.24.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
144.87.28.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
145.79.172.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
147.148.0.0/14BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
147.152.0.0/16BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
147.189.68.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
147.189.76.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
147.78.68.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
147.90.115.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
147.90.127.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
147.90.32.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
147.90.36.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
147.90.55.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
148.252.3.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
148.252.7.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
148.253.220.0/23BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
149.117.130.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
149.254.0.0/16BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
149.254.1.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
15.145.20.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
151.240.180.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid
151.240.184.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 00:00:00	10/16/2026, 16:00:00	✓	×	Currently valid

BGP prefixes have no geographic country; the column is marked not applicable.

Registration and sources

Organization: BT-UK-AS British Telecommunications Limited
RIR: RIPE NCC
Registration country: United Kingdom
Registration date: 8/30/2002, 11:12:47
Abuse contact: abuse@bt.com

Snapshot trend

10/17/2026, 02:40:13543 v47 v622 Upstream · 167 Uncertain

10/15/2026, 21:08:18543 v47 v621 Upstream · 167 Uncertain

10/12/2026, 07:35:57543 v47 v621 Upstream · 167 Uncertain

10/11/2026, 06:15:55543 v47 v621 Upstream · 168 Uncertain

10/10/2026, 05:00:44543 v47 v621 Upstream · 168 Uncertain

10/6/2026, 22:08:25543 v47 v621 Upstream · 168 Uncertain

ASN route snapshotThis page reads collected ASN, prefix, relationship and history data. External interfaces are used for initial collection and scheduled refreshes.Source keys: cha-la-external-routing · rir-rdap-asn · iana-rdap-asn-bootstrap