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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
697,145
Total IPv4 Prefixes
70
Total IPv6 Prefixes
34
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#478 out of 79,179
Registry
Ripe
Registered Country
GB flagGB
Registered Country Name
United Kingdom of Great Britain and Northern Ireland (the)
Registered Date
2002-08-29
Registration Last Change
2025-10-15
Receiving From
ASN
Organisation
AS7922
US flagComcast Cable Communications, LLC
AS3320
DE flagDeutsche Telekom AG
AS3356
US flagLevel 3 Parent, LLC
AS174
US flagCogent Communications, LLC
AS2516
JP flagKDDI CORPORATION
Showing 5 of 76
Transit To
ASN
Organisation
AS65489
WORLD flagPrivate Use AS
AS2856
GB flagBritish Telecommunications PLC
AS72
US flagSchlumberger Limited
AS64541
WORLD flagPrivate Use AS
AS8968
IT flagBT Italia S.p.A.
Showing 5 of 86
IPv4 Active Prefixes
PrefixRange FromRange To
8.12.61.0/248.12.61.08.12.61.255
31.95.0.0/2131.95.0.031.95.7.255
31.95.16.0/2031.95.16.031.95.31.255
31.95.48.0/2131.95.48.031.95.55.255
31.95.96.0/1931.95.96.031.95.127.255
Showing 5 of 70
IPv6 Active Prefixes
PrefixRange FromRange To
2001:740::/322001:740::2001:740:ffff:ffff:ffff:ffff:ffff:ffff
2a00:2000::/232a00:2000::2a00:21ff:ffff:ffff:ffff:ffff:ffff:ffff
2a00:2200::/392a00:2200::2a00:2200:1ff:ffff:ffff:ffff:ffff:ffff
2a00:2200:200::/402a00:2200:200::2a00:2200:2ff:ffff:ffff:ffff:ffff:ffff
2a00:2200:300::/402a00:2200:300::2a00:2200:3ff:ffff:ffff:ffff:ffff:ffff
Showing 5 of 34