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ASN Lookup Tool
AS2856 BT-UK-AS

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ASN Extended Info API & BGP Active Prefixes API
ASN Details
ASN
AS2856
Organisation
British Telecommunications PLC
Name
BT-UK-AS
Total IPv4 Addresses
15,810,721
Total IPv4 Prefixes
509
Total IPv6 Prefixes
24
Total IPv4 Bogon Prefixes
1
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#27 out of 79,487
Registry
Ripe
Registered Country
GB flagGB
Registered Country Name
United Kingdom of Great Britain and Northern Ireland (the)
Registered Date
2002-08-30
Registration Last Change
2025-05-15
Receiving From
ASN
Organisation
AS3257
US flagGTT Communications Inc.
AS3303
CH flagSwisscom (Schweiz) AG
AS3741
ZA flagDimension Data
AS6057
UY flagAdministracion Nacional de Telecomunicaciones
AS8708
RO flagDIGI ROMANIA S.A.
Showing 5 of 60
Transit To
ASN
Organisation
AS6871
GB flagBritish Telecommunications PLC
AS72
US flagSchlumberger Limited
AS65401
WORLD flagPrivate Use AS
AS3917
NL flagShell Information Technology International B.V.
AS33442
US flagZebra Technologies Corporation
Showing 5 of 156
IPv4 Active Prefixes
PrefixRange FromRange To
2.24.0.0/132.24.0.02.31.255.255
5.35.192.0/215.35.192.05.35.199.255
5.80.0.0/165.80.0.05.80.255.255
5.81.0.0/165.81.0.05.81.255.255
5.83.212.0/245.83.212.05.83.212.255
Showing 5 of 508
IPv6 Active Prefixes
PrefixRange FromRange To
2001:4878:c259::/482001:4878:c259::2001:4878:c259:ffff:ffff:ffff:ffff:ffff
2a00:2380::/252a00:2380::2a00:23ff:ffff:ffff:ffff:ffff:ffff:ffff
2a01:4c8::/332a01:4c8::2a01:4c8:7fff:ffff:ffff:ffff:ffff:ffff
2a01:4c8:8000::/342a01:4c8:8000::2a01:4c8:bfff:ffff:ffff:ffff:ffff:ffff
2a01:4c8:c000::/352a01:4c8:c000::2a01:4c8:dfff:ffff:ffff:ffff:ffff:ffff
Showing 5 of 24