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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
12,077,332
Total IPv4 Prefixes
377
Total IPv6 Prefixes
59
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#41 out of 77,675
Registry
Ripe
Registered Country
GB flag GB
Registered Country Name
United Kingdom of Great Britain and Northern Ireland (the)
Registered Date
2002-08-30
Registration Last Change
2022-09-15
Receiving From

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

ASN
Organisation
AS7018
US flagAT&T Services, Inc.
AS3320
DE flagDeutsche Telekom AG
AS174
US flagCogent Communications
AS2516
JP flagKDDI CORPORATION
AS209
US flagCenturyLink Communications, LLC
Showing 5 of 94
Transit To

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

 

ASN
Organisation
AS12576
GB flagEE Limited
AS6871
GB flagBritish Telecommunications PLC
AS72
US flagSchlumberger Limited
AS3917
NL flagShell Information Technology International B.V.
AS33442
US flagZebra Technologies Corporation
Showing 5 of 161
IPv4 Active Prefixes

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

Prefix5.80.0.0/16
Range From5.80.0.0
Range To5.80.255.255
Prefix5.81.0.0/16
Range From5.81.0.0
Range To5.81.255.255
Prefix5.181.136.0/22
Range From5.181.136.0
Range To5.181.139.255
Prefix15.145.20.0/22
Range From15.145.20.0
Range To15.145.23.255
Prefix31.48.0.0/13
Range From31.48.0.0
Range To31.55.255.255
Showing 5 of 377
IPv6 Active Prefixes
Prefix2001:4878:c259::/48
Range From2001:4878:c259::
Range To2001:4878:c259:ffff:ffff:ffff:ffff:ffff
Prefix2a00:2380::/32
Range From2a00:2380::
Range To2a00:2380:ffff:ffff:ffff:ffff:ffff:ffff
Prefix2a00:2381::/37
Range From2a00:2381::
Range To2a00:2381:7ff:ffff:ffff:ffff:ffff:ffff
Prefix2a00:2381:800::/44
Range From2a00:2381:800::
Range To2a00:2381:80f:ffff:ffff:ffff:ffff:ffff
Prefix2a00:2381:810::/46
Range From2a00:2381:810::
Range To2a00:2381:813:ffff:ffff:ffff:ffff:ffff
Showing 5 of 59
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.