51100 Kier - Kier Ltd, GB
Adjacency: 1 Upstream: 1 Downstream: 0
Upstream Adjacent AS list
AS1273 CW - IDDQD-AS, EU
Rank AS Type Originate Addr Space (pfx) Transit Addr space (pfx) Description 22346 AS51100 ORIGIN Originate: 2560 /20.68 Transit: 0 /0.00 Kier - Kier Ltd, 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 % 13160 AS51100 Kier - Kier Ltd, GB 7 5 2 4 3 42.86% Prefix AS Path Aggregation Suggestion 91.195.112.0/23 4777 2516 1273 51100 91.195.112.0/23 4608 7575 1299 1273 51100 + Announce - aggregate of 91.195.112.0/24 (4608 7575 1299 1273 51100) and 91.195.113.0/24 (4608 7575 1299 1273 51100) 91.195.112.0/24 4608 7575 1299 1273 51100 - Withdrawn - aggregated with 91.195.113.0/24 (4608 7575 1299 1273 51100) 91.195.113.0/24 4608 7575 1299 1273 51100 - Withdrawn - aggregated with 91.195.112.0/24 (4608 7575 1299 1273 51100) 185.239.164.0/22 4777 2516 1273 51100 + Announce - aggregate of 185.239.164.0/23 (4777 2516 1273 51100) and 185.239.166.0/23 (4777 2516 1273 51100) 185.239.164.0/23 4777 2516 1273 51100 - Withdrawn - aggregated with 185.239.166.0/23 (4777 2516 1273 51100) 185.239.166.0/23 4777 2516 1273 51100 - Withdrawn - aggregated with 185.239.164.0/23 (4777 2516 1273 51100) 185.239.166.0/24 4777 2516 1273 51100 - Withdrawn - matching aggregate 185.239.166.0/23 4777 2516 1273 51100 185.239.167.0/24 4608 7575 1299 1273 51100
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS51100 6 More Specifics 7 Total Advertisements Kier - Kier Ltd, GB
91.195.112.0/24 91.195.112.0/23
91.195.113.0/24 91.195.112.0/23
185.239.164.0/23 185.239.164.0/22
185.239.166.0/23 185.239.164.0/22
185.239.166.0/24 185.239.164.0/22
185.239.167.0/24 185.239.164.0/22
whois: 402609
IANA has recorded AS51100 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS51100\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 'AS50893 - AS51311'
as-block: AS50893 - AS51311
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: 2024-12-10T14:54:30Z
last-modified: 2024-12-10T14:54:30Z
source: RIPE
% Information related to 'AS51100'
% Abuse contact for 'AS51100' is 'abuse@kier.co.uk'
aut-num: AS51100
as-name: Kier
org: ORG-KL233-RIPE
import: from AS1273 accept ANY
export: to AS1273 announce AS51100
admin-c: AA43437-RIPE
tech-c: TA9096-RIPE
abuse-c: AR44377-RIPE
status: ASSIGNED
mnt-by: RIPE-NCC-END-MNT
mnt-by: uk-kierltd-1-mnt
created: 2018-01-04T15:31:34Z
last-modified: 2024-06-25T16:17:07Z
source: RIPE # Filtered
organisation: ORG-KL233-RIPE
org-name: Kier Ltd
country: GB
reg-nr: 01611136
org-type: LIR
address: 2nd Floor, Optimum House, Clippers Quay
address: M50 3XP
address: Salford
address: UNITED KINGDOM
phone: +44 0161 656 9400
admin-c: AA43437-RIPE
tech-c: TA9096-RIPE
abuse-c: AR44377-RIPE
mnt-ref: uk-kierltd-1-mnt
mnt-by: RIPE-NCC-HM-MNT
mnt-by: uk-kierltd-1-mnt
created: 2017-12-20T08:15:32Z
last-modified: 2026-05-13T07:09:46Z
source: RIPE # Filtered
%ERROR:201: access denied for 2401:2000:6660:0:0:0:0:13
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