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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
12026304
Total IPv4 Prefixes
359
Total IPv6 Prefixes
72
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#42 out of 76,500
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
AS174
US flagCogent Communications
AS6830
NL flagLiberty Global B.V.
AS3303
CH flagSwisscom (Schweiz) AG
AS4788
MY flagTM TECHNOLOGY SERVICES SDN BHD
AS14061
US flagDigitalOcean, LLC
Showing 5 of 35
Transit To

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

 

ASN
Organisation
AS202206
GB flagFat Hosting Limited
AS12576
GB flagEE Limited
AS6871
GB flagBritish Telecommunications PLC
AS72
US flagSchlumberger Limited
AS3917
EU flagShell Information Technology International B.V.
Showing 5 of 178
IPv4 Active Prefixes

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

Prefix103.10.251.0/24
Range From103.10.251.0
Range To103.10.251.255
Prefix109.144.0.0/12
Range From109.144.0.0
Range To109.159.255.255
Prefix109.205.158.0/24
Range From109.205.158.0
Range To109.205.158.255
Prefix116.66.142.0/23
Range From116.66.142.0
Range To116.66.143.255
Prefix132.146.0.0/16
Range From132.146.0.0
Range To132.146.255.255
Showing 5 of 359
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::/33
Range From2a00:2381::
Range To2a00:2381:7fff:ffff:ffff:ffff:ffff:ffff
Prefix2a00:2381:8000::/34
Range From2a00:2381:8000::
Range To2a00:2381:bfff:ffff:ffff:ffff:ffff:ffff
Prefix2a00:2381:c000::/35
Range From2a00:2381:c000::
Range To2a00:2381:dfff:ffff:ffff:ffff:ffff:ffff
Showing 5 of 72
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.