51561 AS-ICUK, GB
Adjacency: 7 Upstream: 5 Downstream: 2
Upstream Adjacent AS list
AS7575 AARNET-AS-AP Australian Academic and Research Network AARNet, AU
AS13335 CLOUDFLARENET - Cloudflare, Inc., US
AS174 COGENT-174 - Cogent Communications, LLC, US
AS2914 NTT-DATA-2914 - NTT America, Inc., US
AS3356 LEVEL3 - Level 3 Parent, LLC, US
Downstream Adjacent AS list
AS201060 SNETTERTON, GB
AS199204 WEBMATE, GB
Rank AS Type Originate Addr Space (pfx) Transit Addr space (pfx) Description 2836 AS51561 ORIGIN Originate: 75776 /15.79 Transit: 0 /0.00 AS-ICUK, GB
Aggregation Suggestions
Filter: Aggregates, Specifics
This report does not take into account conditions local to each origin AS in terms of policy or traffic engineering requirements, so this is an approximate guideline as to aggregation possibilities.
Rank AS AS Name Current Wthdw Aggte Annce Redctn % 7521 AS51561 AS-ICUK, GB 61 12 6 55 6 9.84% Prefix AS Path Aggregation Suggestion 2.56.84.0/22 4608 7575 51561 5.133.168.0/22 4608 7575 51561 + Announce - aggregate of 5.133.168.0/23 (4608 7575 51561) and 5.133.170.0/23 (4608 7575 51561) 5.133.168.0/23 4608 7575 51561 - Withdrawn - aggregated with 5.133.170.0/23 (4608 7575 51561) 5.133.170.0/23 4608 7575 51561 - Withdrawn - aggregated with 5.133.168.0/23 (4608 7575 51561) 5.254.162.0/23 4608 7575 51561 5.254.164.0/23 4608 7575 51561 37.235.43.0/24 4608 7575 51561 45.93.112.0/22 4608 7575 51561 45.145.86.0/23 4608 7575 51561 46.33.128.0/19 4608 7575 51561 46.33.128.0/24 4777 13335 51561 46.33.130.0/24 4777 2497 174 51561 46.33.156.0/24 4777 2497 174 51561 46.102.192.0/19 4608 7575 51561 46.102.192.0/23 4777 13335 51561 + Announce - aggregate of 46.102.192.0/24 (4777 13335 51561) and 46.102.193.0/24 (4777 13335 51561) 46.102.192.0/24 4777 13335 51561 - Withdrawn - aggregated with 46.102.193.0/24 (4777 13335 51561) 46.102.193.0/24 4777 13335 51561 - Withdrawn - aggregated with 46.102.192.0/24 (4777 13335 51561) 46.226.120.0/24 4608 7575 51561 80.95.192.0/20 4608 7575 51561 80.209.128.0/19 4608 7575 51561 80.209.128.0/24 4777 13335 51561 80.209.155.0/24 4777 2497 3356 51561 80.209.159.0/24 4777 13335 51561 80.209.160.0/20 4608 7575 51561 80.209.176.0/21 4608 7575 51561 80.209.184.0/22 4608 7575 51561 80.247.216.0/24 4608 7575 51561 82.39.142.0/24 4608 7575 51561 89.107.24.0/22 4608 7575 51561 91.233.33.0/24 4608 7575 51561 138.124.128.0/20 4608 7575 51561 138.124.128.0/24 4777 2497 174 51561 138.124.134.0/23 4777 2497 174 51561 + Announce - aggregate of 138.124.134.0/24 (4777 2497 174 51561) and 138.124.135.0/24 (4777 2497 174 51561) 138.124.134.0/24 4777 2497 174 51561 - Withdrawn - aggregated with 138.124.135.0/24 (4777 2497 174 51561) 138.124.135.0/24 4777 2497 174 51561 - Withdrawn - aggregated with 138.124.134.0/24 (4777 2497 174 51561) 138.124.136.0/23 4777 2497 174 51561 + Announce - aggregate of 138.124.136.0/24 (4777 2497 174 51561) and 138.124.137.0/24 (4777 2497 174 51561) 138.124.136.0/24 4777 2497 174 51561 - Withdrawn - aggregated with 138.124.137.0/24 (4777 2497 174 51561) 138.124.137.0/24 4777 2497 174 51561 - Withdrawn - aggregated with 138.124.136.0/24 (4777 2497 174 51561) 138.124.138.0/24 4777 2497 174 51561 138.124.142.0/24 4777 2497 174 51561 181.215.32.0/24 4608 7575 51561 185.2.236.0/22 4608 7575 51561 185.32.55.0/24 4608 7575 51561 185.132.52.0/24 4608 7575 51561 185.137.240.0/24 4777 13335 51561 185.140.16.0/23 4777 2497 174 51561 185.140.18.0/23 4608 7575 51561 185.145.152.0/22 4608 7575 51561 185.145.152.0/24 4777 2497 174 51561 185.152.2.0/24 4608 7575 51561 185.201.208.0/22 4608 7575 51561 185.234.255.0/24 4608 7575 51561 185.243.62.0/23 4608 7575 51561 + Announce - aggregate of 185.243.62.0/24 (4608 7575 51561) and 185.243.63.0/24 (4608 7575 51561) 185.243.62.0/24 4608 7575 51561 - Withdrawn - aggregated with 185.243.63.0/24 (4608 7575 51561) 185.243.63.0/24 4608 7575 51561 - Withdrawn - aggregated with 185.243.62.0/24 (4608 7575 51561) 185.253.88.0/24 4608 7575 51561 188.211.249.0/24 4608 7575 51561 188.240.160.0/19 4608 7575 51561 188.240.160.0/24 4777 13335 51561 188.240.172.0/23 4777 13335 51561 + Announce - aggregate of 188.240.172.0/24 (4777 13335 51561) and 188.240.173.0/24 (4777 13335 51561) 188.240.172.0/24 4777 13335 51561 - Withdrawn - aggregated with 188.240.173.0/24 (4777 13335 51561) 188.240.173.0/24 4777 13335 51561 - Withdrawn - aggregated with 188.240.172.0/24 (4777 13335 51561) 188.240.191.0/24 4777 13335 51561 193.161.9.0/24 4608 7575 51561 193.161.10.0/24 4608 7575 51561 193.187.0.0/24 4608 7575 51561 205.157.160.0/19 4608 7575 51561
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS51561 44 More Specifics 61 Total Advertisements AS-ICUK, GB
5.133.168.0/23 5.133.168.0/22
5.133.170.0/23 5.133.168.0/22
5.254.162.0/23 5.254.160.0/21
5.254.164.0/23 5.254.160.0/21
37.235.43.0/24 37.235.40.0/21
45.145.86.0/23 45.145.84.0/22
46.33.128.0/24 46.33.128.0/19
46.33.130.0/24 46.33.128.0/19
46.33.156.0/24 46.33.128.0/19
46.102.192.0/24 46.102.192.0/19
46.102.193.0/24 46.102.192.0/19
80.209.128.0/19 80.209.128.0/18
80.209.128.0/24 80.209.128.0/18
80.209.155.0/24 80.209.128.0/18
80.209.159.0/24 80.209.128.0/18
80.209.160.0/20 80.209.128.0/18
80.209.176.0/21 80.209.128.0/18
80.209.184.0/22 80.209.128.0/18
80.247.216.0/24 80.247.216.0/22
82.39.142.0/24 82.38.0.0/15
138.124.128.0/24 138.124.128.0/20
138.124.134.0/24 138.124.128.0/20
138.124.135.0/24 138.124.128.0/20
138.124.136.0/24 138.124.128.0/20
138.124.137.0/24 138.124.128.0/20
138.124.138.0/24 138.124.128.0/20
138.124.142.0/24 138.124.128.0/20
181.215.32.0/24 181.214.0.0/15
185.32.55.0/24 185.32.52.0/22
185.132.52.0/24 185.132.52.0/22
185.137.240.0/24 185.137.240.0/23
185.140.16.0/23 185.140.16.0/22
185.140.18.0/23 185.140.16.0/22
185.145.152.0/24 185.145.152.0/22
185.152.2.0/24 185.152.0.0/22
185.243.62.0/24 185.243.60.0/22
185.243.63.0/24 185.243.60.0/22
185.253.88.0/24 185.253.88.0/22
188.240.160.0/24 188.240.160.0/19
188.240.172.0/24 188.240.160.0/19
188.240.173.0/24 188.240.160.0/19
188.240.191.0/24 188.240.160.0/19
193.161.9.0/24 193.161.8.0/22
193.161.10.0/24 193.161.8.0/22
whois: 402332
IANA has recorded AS51561 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS51561\n % This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See https://docs.db.ripe.net/terms-conditions.html
% Note: this output has been filtered.
% Information related to 'AS51357 - AS51817'
as-block: AS51357 - AS51817
descr: RIPE NCC ASN block
remarks: These AS Numbers are assigned to network operators in the RIPE NCC service region.
mnt-by: RIPE-NCC-HM-MNT
created: 2025-02-13T13:57:44Z
last-modified: 2025-02-13T13:57:44Z
source: RIPE
% Information related to 'AS51561'
% Abuse contact for 'AS51561' is 'abuse@interdns.co.uk'
aut-num: AS51561
as-name: AS-ICUK
org: ORG-ICSL4-RIPE
import: from AS174 accept ANY
import: from AS3356 accept ANY
import: from AS2914 accept ANY
export: to AS174 announce AS-ICUK
export: to AS3356 announce AS-ICUK
export: to AS2914 announce AS-ICUK
admin-c: IRA19-RIPE
tech-c: IRA19-RIPE
status: ASSIGNED
mnt-by: RIPE-NCC-END-MNT
mnt-by: ICUK-MNT
created: 2010-09-28T13:41:49Z
last-modified: 2026-02-24T16:52:22Z
source: RIPE
remarks: cf-validation: 30b6d34f3d64496a9a733f6622439db3
organisation: ORG-ICSL4-RIPE
org-name: ICUK Computing Services Limited
country: GB
org-type: LIR
address: Suite 5, Metropolitan House, 38-40 High Street
address: CR0 1YB
address: Croydon
address: UNITED KINGDOM
phone: +443450099175
admin-c: TO691-RIPE
admin-c: LC6988-RIPE
abuse-c: IRA19-RIPE
mnt-ref: RIPE-NCC-HM-MNT
mnt-ref: ICUK-MNT
mnt-by: RIPE-NCC-HM-MNT
mnt-by: ICUK-MNT
created: 2010-07-07T12:52:32Z
last-modified: 2020-12-16T13:11:05Z
source: RIPE # Filtered
role: ICUK Ripe Administrator
address: Suite 5, Metropolitan House, 38-40 High Street, Croydon, CR0 1YB
admin-c: LC6988-RIPE
tech-c: TO691-RIPE
nic-hdl: IRA19-RIPE
mnt-by: ICUK-MNT
created: 2010-09-09T13:50:17Z
last-modified: 2016-08-16T09:03:06Z
source: RIPE # Filtered
abuse-mailbox: abuse@interdns.co.uk
% This query was served by the RIPE Database Query Service version 1.121.2 (BUSA)