21054 UK-NATWEST-AS21054 - Natwest Markets PLC, GB
Adjacency: 2 Upstream: 2 Downstream: 0
Upstream Adjacent AS list
AS1273 CW - IDDQD-AS, EU
AS32787 PROLEXIC-TECHNOLOGIES-DDOS-MITIGATION-NETWORK - Akamai Technologies, Inc., US
Rank AS Type Originate Addr Space (pfx) Transit Addr space (pfx) Description 1778 AS21054 ORIGIN Originate: 134400 /14.96 Transit: 0 /0.00 UK-NATWEST-AS21054 - Natwest Markets PLC, 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 % 5791 AS21054 UK-NATWEST-AS21054 - Natwest Markets PLC, GB 13 11 3 5 8 61.54% Prefix AS Path Aggregation Suggestion 155.136.0.0/16 4777 2516 1273 21054 21054 21054 21054 155.136.0.0/16 4777 32787 21054 + Announce - aggregate of 155.136.0.0/17 (4777 32787 21054) and 155.136.128.0/17 (4777 32787 21054) 155.136.0.0/17 4777 32787 21054 - Withdrawn - aggregated with 155.136.128.0/17 (4777 32787 21054) 155.136.60.0/22 4777 2516 1273 21054 21054 21054 21054 155.136.60.0/22 4777 32787 21054 + Announce - aggregate of 155.136.60.0/23 (4777 32787 21054) and 155.136.62.0/23 (4777 32787 21054) 155.136.60.0/24 4777 32787 21054 - Withdrawn - aggregated with 155.136.61.0/24 (4777 32787 21054) 155.136.61.0/24 4777 32787 21054 - Withdrawn - aggregated with 155.136.60.0/24 (4777 32787 21054) 155.136.62.0/24 4777 32787 21054 - Withdrawn - aggregated with 155.136.63.0/24 (4777 32787 21054) 155.136.63.0/24 4777 32787 21054 - Withdrawn - aggregated with 155.136.62.0/24 (4777 32787 21054) 155.136.128.0/17 4777 32787 21054 - Withdrawn - aggregated with 155.136.0.0/17 (4777 32787 21054) 155.136.144.0/24 4777 32787 21054 - Withdrawn - matching aggregate 155.136.128.0/17 4777 32787 21054 155.136.146.0/24 4777 32787 21054 - Withdrawn - matching aggregate 155.136.128.0/17 4777 32787 21054 155.136.197.0/24 4777 32787 21054 - Withdrawn - matching aggregate 155.136.128.0/17 4777 32787 21054 155.136.202.0/23 4777 32787 21054 + Announce - aggregate of 155.136.202.0/24 (4777 32787 21054) and 155.136.203.0/24 (4777 32787 21054) 155.136.202.0/24 4777 32787 21054 - Withdrawn - aggregated with 155.136.203.0/24 (4777 32787 21054) 155.136.203.0/24 4777 32787 21054 - Withdrawn - aggregated with 155.136.202.0/24 (4777 32787 21054)
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS21054 12 More Specifics 13 Total Advertisements UK-NATWEST-AS21054 - Natwest Markets PLC, GB
155.136.0.0/17 155.136.0.0/16
155.136.60.0/22 155.136.0.0/16
155.136.60.0/24 155.136.0.0/16
155.136.61.0/24 155.136.0.0/16
155.136.62.0/24 155.136.0.0/16
155.136.63.0/24 155.136.0.0/16
155.136.128.0/17 155.136.0.0/16
155.136.144.0/24 155.136.0.0/16
155.136.146.0/24 155.136.0.0/16
155.136.197.0/24 155.136.0.0/16
155.136.202.0/24 155.136.0.0/16
155.136.203.0/24 155.136.0.0/16
whois: 402603
IANA has recorded AS21054 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS21054\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 'AS21004 - AS21151'
as-block: AS21004 - AS21151
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: 2018-11-22T15:27:27Z
last-modified: 2018-11-22T15:27:27Z
source: RIPE
% Information related to 'AS21054'
% Abuse contact for 'AS21054' is 'ripe-abuse@rbs.com'
aut-num: AS21054
as-name: UK-NATWEST-AS21054
org: ORG-TRBO2-RIPE
descr: Edinburgh
import: from AS2856 action pref=100; accept ANY
import: from AS1273 action pref=100; accept ANY
import: from AS32787 action pref=100; accept ANY
import: from AS4755 action pref=100; accept ANY
import: from AS9498 action pref=100; accept ANY
export: to AS2856 announce AS21054
export: to AS1273 announce AS21054
export: to AS32787 announce AS21054
export: to AS4755 announce AS21054
export: to AS9498 announce AS21054
default: to AS1273 action pref=100; networks ANY
admin-c: CL5041-RIPE
tech-c: RTST1-RIPE
status: ASSIGNED
mnt-by: RIPE-NCC-END-MNT
mnt-by: RBSG-MNT
created: 2002-03-07T14:53:40Z
last-modified: 2026-04-10T15:39:43Z
source: RIPE
organisation: ORG-TRBO2-RIPE
org-name: Natwest Markets PLC
country: GB
reg-nr: SC090312
org-type: LIR
address: 250 Bishopsgate
address: EC2M 3UR
address: London
address: UNITED KINGDOM
phone: +447929792793
abuse-c: AR17872-RIPE
mnt-ref: RBSG-MNT
mnt-ref: RIPE-NCC-HM-MNT
mnt-by: RIPE-NCC-HM-MNT
mnt-by: RBSG-MNT
created: 2013-06-12T10:43:32Z
last-modified: 2026-05-13T07:21:09Z
source: RIPE # Filtered
role: Technical Role
address: 250 Bishopsgate
address: London
address: EC2M 3UR
abuse-mailbox: ripe-abuse@rbs.com
nic-hdl: RTST1-RIPE
mnt-by: RBSG-MNT
created: 2018-03-23T12:27:34Z
last-modified: 2026-04-10T15:08:40Z
source: RIPE # Filtered
%ERROR:201: access denied for 2401:2000:6660:0:0:0:0:13
%
% Queries from your IP address have passed the daily limit of controlled objects.
% Access from your host has been temporarily denied.
% For more information, see
% https://docs.db.ripe.net/FAQ#why-did-i-receive-an-error-201-access-denied
% This query was served by the RIPE Database Query Service version 1.122.1 (BUSA)