21301 UK-NATWEST-AS21301 - UK-NATWEST-AS21301, 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 18148 AS21301 ORIGIN Originate: 3840 /20.09 Transit: 0 /0.00 UK-NATWEST-AS21301 - UK-NATWEST-AS21301, 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 % 9910 AS21301 UK-NATWEST-AS21301 - UK-NATWEST-AS21301, GB 10 6 2 6 4 40.00% Prefix AS Path Aggregation Suggestion 155.136.56.0/22 4777 2516 1273 21301 21301 21301 21301 155.136.56.0/22 4777 32787 21301 + Announce - aggregate of 155.136.56.0/23 (4777 32787 21301) and 155.136.58.0/23 (4777 32787 21301) 155.136.56.0/24 4777 32787 21301 - Withdrawn - aggregated with 155.136.57.0/24 (4777 32787 21301) 155.136.57.0/24 4777 32787 21301 - Withdrawn - aggregated with 155.136.56.0/24 (4777 32787 21301) 155.136.58.0/24 4777 32787 21301 - Withdrawn - aggregated with 155.136.59.0/24 (4777 32787 21301) 155.136.59.0/24 4777 32787 21301 - Withdrawn - aggregated with 155.136.58.0/24 (4777 32787 21301) 155.136.151.0/24 4777 32787 21301 155.136.200.0/23 4777 2516 1273 21301 21301 21301 21301 155.136.200.0/23 4777 32787 21301 + Announce - aggregate of 155.136.200.0/24 (4777 32787 21301) and 155.136.201.0/24 (4777 32787 21301) 155.136.200.0/24 4777 32787 21301 - Withdrawn - aggregated with 155.136.201.0/24 (4777 32787 21301) 155.136.201.0/24 4777 32787 21301 - Withdrawn - aggregated with 155.136.200.0/24 (4777 32787 21301) 155.136.202.0/23 4777 2516 1273 21301 21301 21301 21301
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS21301 10 More Specifics 10 Total Advertisements UK-NATWEST-AS21301 - UK-NATWEST-AS21301, GB
155.136.56.0/22 155.136.0.0/16
155.136.56.0/24 155.136.0.0/16
155.136.57.0/24 155.136.0.0/16
155.136.58.0/24 155.136.0.0/16
155.136.59.0/24 155.136.0.0/16
155.136.151.0/24 155.136.0.0/16
155.136.200.0/23 155.136.0.0/16
155.136.200.0/24 155.136.0.0/16
155.136.201.0/24 155.136.0.0/16
155.136.202.0/23 155.136.0.0/16
whois: 402603
IANA has recorded AS21301 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS21301\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 'AS21281 - AS21390'
as-block: AS21281 - AS21390
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: 2018-11-22T15:27:28Z
last-modified: 2018-11-22T15:27:28Z
source: RIPE
% Information related to 'AS21301'
% Abuse contact for 'AS21301' is 'abuse.cz@o2.com'
aut-num: AS21301
as-name: UK-NATWEST-AS21301
descr: EDINBURGH
org: ORG-TRBo1-RIPE
import: from AS1273 action pref=100; accept ANY
import: from AS32787 action pref=100; accept ANY
import: from AS2856 action pref=100; accept ANY
export: to AS1273 announce AS21301
export: to AS32787 announce AS21301
export: to AS2856 announce AS21301
tech-c: RTST1-RIPE
status: ASSIGNED
mnt-by: RIPE-NCC-END-MNT
admin-c: CL5041-RIPE
mnt-by: RBSG-MNT
created: 2001-10-24T12:23:55Z
last-modified: 2026-04-10T15:50:30Z
source: RIPE
sponsoring-org: ORG-UA24-RIPE
organisation: ORG-TRBO1-RIPE
org-name: Natwest Markets PLC
country: GB
reg-nr: Not Applicable
org-type: OTHER
address: 135 Bishopsgate London EC2M 3UR UK
abuse-c: AR30109-RIPE
phone: +44 20 3361 7879
mnt-ref: AS1849-MNT
mnt-by: AS1849-MNT
created: 2009-12-18T13:54:36Z
last-modified: 2026-05-13T06:45:20Z
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
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