Autonomous system profile

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

AS13205

Announcement observedRIPE NCC

British Telecommunications Limited · UNSPECIFIED

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

Last active9/30/2026, 08:54:54Snapshot expired

View network topology RDAP registration

ASN: AS13205
Registration country: United Kingdom
Name: British Telecommunications Limited
Abbreviation: UNSPECIFIED
Registration date: 1/1/1970, 00:00:00
Status: Announcement observed
RIR: RIPE NCC

Network relationships and announced prefixes

ASN / prefix	Description / organization	Geographic scope	First seen	Last active	IPv4	IPv6	Status
217.140.0.0/20BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 00:00:00	10/13/2026, 00:00:00	✓	×	Currently valid
217.140.12.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 00:00:00	10/13/2026, 00:00:00	✓	×	Currently valid
217.140.12.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 00:00:00	10/13/2026, 00:00:00	✓	×	Currently valid
217.140.13.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 00:00:00	10/13/2026, 00:00:00	✓	×	Currently valid
217.140.32.0/19BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 00:00:00	10/13/2026, 00:00:00	✓	×	Currently valid
31.11.56.0/23BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 00:00:00	10/13/2026, 00:00:00	✓	×	Currently valid
78.109.0.0/20BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 00:00:00	10/13/2026, 00:00:00	✓	×	Currently valid
78.109.0.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 00:00:00	10/13/2026, 00:00:00	✓	×	Currently valid
78.109.10.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 00:00:00	10/13/2026, 00:00:00	✓	×	Currently valid
78.109.11.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 00:00:00	10/13/2026, 00:00:00	✓	×	Currently valid
78.109.5.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 00:00:00	10/13/2026, 00:00:00	✓	×	Currently valid
78.109.6.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 00:00:00	10/13/2026, 00:00:00	✓	×	Currently valid
78.109.7.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 00:00:00	10/13/2026, 00:00:00	✓	×	Currently valid
78.109.9.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 00:00:00	10/13/2026, 00:00:00	✓	×	Currently valid

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

Registration and sources

Organization: British Telecommunications Limited
RIR: RIPE NCC
Registration country: United Kingdom
Registration date: 1/1/1970, 00:00:00
Abuse contact: protect@bt.com

Snapshot trend

9/30/2026, 08:54:5414 v40 v62 Upstream · 0 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