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ASN Lookup Tool
AS5400 BT

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ASN Extended Info API & BGP Active Prefixes API
ASN Details
ASN
AS5400
Organisation
British Telecommunications PLC
Name
BT
Total IPv4 Addresses
704,700
Total IPv4 Prefixes
65
Total IPv6 Prefixes
28
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#472 out of 78,424
Registry
Ripe
Registered Country
GB flag GB
Registered Country Name
United Kingdom of Great Britain and Northern Ireland (the)
Registered Date
2002-08-29
Registration Last Change
2025-04-28
Receiving From

The list of active Autonomous Systems (ASs) which send traffic to that ASN.

ASN
Organisation
AS56662
PL flagMarcin Gondek
AS7922
US flagComcast Cable Communications, LLC
AS3320
DE flagDeutsche Telekom AG
AS3356
US flagLevel 3 Parent, LLC
AS174
US flagCogent Communications
Showing 5 of 85
Transit To

The list of active Autonomous Systems (ASs) which receive traffic from that ASN.

 

ASN
Organisation
AS2856
GB flagBritish Telecommunications PLC
AS72
US flagSchlumberger Limited
AS8968
IT flagBT Italia S.p.A.
AS2110
IE flagBT Communications Ireland Limited
AS42848
LU flagEuropean Commission
Showing 5 of 85
IPv4 Active Prefixes

This provides the list of IPv4 address space routes/prefixes currently announced on Border Gateway Protocol (BGP).

Prefix8.12.61.0/24
Range From8.12.61.0
Range To8.12.61.255
Prefix31.95.0.0/21
Range From31.95.0.0
Range To31.95.7.255
Prefix31.95.16.0/20
Range From31.95.16.0
Range To31.95.31.255
Prefix31.95.48.0/21
Range From31.95.48.0
Range To31.95.55.255
Prefix31.95.96.0/19
Range From31.95.96.0
Range To31.95.127.255
Showing 5 of 65
IPv6 Active Prefixes
Prefix2001:740::/32
Range From2001:740::
Range To2001:740:ffff:ffff:ffff:ffff:ffff:ffff
Prefix2a00:2000::/23
Range From2a00:2000::
Range To2a00:21ff:ffff:ffff:ffff:ffff:ffff:ffff
Prefix2a00:2200::/39
Range From2a00:2200::
Range To2a00:2200:1ff:ffff:ffff:ffff:ffff:ffff
Prefix2a00:2200:200::/40
Range From2a00:2200:200::
Range To2a00:2200:2ff:ffff:ffff:ffff:ffff:ffff
Prefix2a00:2200:300::/40
Range From2a00:2200:300::
Range To2a00:2200:3ff:ffff:ffff:ffff:ffff:ffff
Showing 5 of 28
Autonomous System (AS) is a network (or collection of networks) that are all managed and supervised by a single entity or organisation. This tool provides a comprehensive ownership and connectivity report for any given AS number.