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ASN Lookup Tool
AS3300 BT

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ASN Extended Info API & BGP Active Prefixes API
ASN Details
ASN
AS3300
Organisation
British Telecommunications PLC
Name
BT
Total IPv4 Addresses
513,248
Total IPv4 Prefixes
181
Total IPv6 Prefixes
68
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#573 out of 79,667
Registry
Ripe
Registered Country
GB flagGB
Registered Country Name
United Kingdom of Great Britain and Northern Ireland (the)
Registered Date
2002-09-19
Registration Last Change
2026-03-02
Receiving From
ASN
Organisation
AS33891
DE flagCore-Backbone GmbH
AS4766
KR flagKorea Telecom
AS7029
US flagWindstream Communications LLC
AS4230
BR flagCLARO S.A.
AS2914
US flagNTT America, Inc.
Showing 5 of 72
Transit To
ASN
Organisation
AS72
US flagSchlumberger Limited
AS19812
US flagBT Americas, Inc
AS45187
HK flagRackspace.com Hong Kong Limited
AS6220
US flaginContact Inc.
AS64721
WORLD flagPrivate Use AS
Showing 5 of 26
IPv4 Active Prefixes
PrefixRange FromRange To
61.14.0.0/2461.14.0.061.14.0.255
61.14.1.0/2461.14.1.061.14.1.255
61.14.2.0/2361.14.2.061.14.3.255
61.14.4.0/2361.14.4.061.14.5.255
61.14.6.0/2461.14.6.061.14.6.255
Showing 5 of 181
IPv6 Active Prefixes
PrefixRange FromRange To
2402:fb00::/372402:fb00::2402:fb00:7ff:ffff:ffff:ffff:ffff:ffff
2402:fb00:800::/382402:fb00:800::2402:fb00:bff:ffff:ffff:ffff:ffff:ffff
2402:fb00:c00::/392402:fb00:c00::2402:fb00:dff:ffff:ffff:ffff:ffff:ffff
2402:fb00:e00::/402402:fb00:e00::2402:fb00:eff:ffff:ffff:ffff:ffff:ffff
2402:fb00:f00::/402402:fb00:f00::2402:fb00:fff:ffff:ffff:ffff:ffff:ffff
Showing 5 of 68