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ASN Lookup Tool
AS51561 AS-ICUK

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ASN Extended Info API & BGP Active Prefixes API
ASN Details
ASN
AS51561
Organisation
ICUK Computing Services Limited
Name
AS-ICUK
Total IPv4 Addresses
62,208
Total IPv4 Prefixes
117
Total IPv6 Prefixes
17
Total IPv4 Bogon Prefixes
0
Total IPv6 Bogon Prefixes
0
IPv4 Space Rank
#3,754 out of 79,658
Registry
Ripe
Registered Country
GB flagGB
Registered Country Name
United Kingdom of Great Britain and Northern Ireland (the)
Registered Date
2010-09-28
Registration Last Change
2026-02-24
Receiving From
ASN
Organisation
AS1239
US flagCogent Communications, LLC
AS3356
US flagLevel 3 Parent, LLC
AS174
US flagCogent Communications, LLC
AS2914
US flagNTT America, Inc.
AS3741
ZA flagDimension Data
Showing 5 of 58
Transit To
ASN
Organisation
AS201060
GB flagSNETTERTON TELECOM LIMITED
AS199204
GB flagWebmate Internet Services Ltd.
IPv4 Active Prefixes
PrefixRange FromRange To
2.56.84.0/222.56.84.02.56.87.255
5.133.168.0/235.133.168.05.133.169.255
5.133.170.0/235.133.170.05.133.171.255
5.254.162.0/235.254.162.05.254.163.255
5.254.164.0/235.254.164.05.254.165.255
Showing 5 of 117
IPv6 Active Prefixes
PrefixRange FromRange To
2a00:b900::/472a00:b900::2a00:b900:1:ffff:ffff:ffff:ffff:ffff
2a00:b900:2::/482a00:b900:2::2a00:b900:2:ffff:ffff:ffff:ffff:ffff
2a00:b900:3::/482a00:b900:3::2a00:b900:3:ffff:ffff:ffff:ffff:ffff
2a00:b900:4::/462a00:b900:4::2a00:b900:7:ffff:ffff:ffff:ffff:ffff
2a00:b900:8::/452a00:b900:8::2a00:b900:f:ffff:ffff:ffff:ffff:ffff
Showing 5 of 17