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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
12,682,224
Total IPv4 Prefixes
427
Total IPv6 Prefixes
6
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#34 out of 79,000
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
AS3303
CH flagSwisscom (Schweiz) AG
AS8220
GB flagCOLT Technology Services Group Limited
AS6461
US flagZayo Bandwidth
AS5413
GB flagWavenet Limited
AS5400
GB flagBritish Telecommunications PLC
Showing 5 of 26
Transit To
ASN
Organisation
AS6871
GB flagBritish Telecommunications PLC
AS72
US flagSchlumberger Limited
AS12576
GB flagEE Limited
AS65401
WORLD flagPrivate Use AS
AS3917
NL flagShell Information Technology International B.V.
Showing 5 of 153
IPv4 Active Prefixes
PrefixRange FromRange To
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
5.83.213.0/245.83.213.05.83.213.255
Showing 5 of 427
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:f400::/482a01:4c8:f400::2a01:4c8:f400:ffff:ffff:ffff:ffff:ffff
2a01:4c8:f401::/482a01:4c8:f401::2a01:4c8:f401:ffff:ffff:ffff:ffff:ffff
2a02:ee80:4176::/472a02:ee80:4176::2a02:ee80:4177:ffff:ffff:ffff:ffff:ffff
Showing 5 of 6