AS21054 — RBSG-UK-AS Edinburgh

AS21054 announces 3 IPv4 prefixes covering 1,792 addresses and 0 IPv6 prefixes.

About this network

The AS handle RBSG-UK-AS Edinburgh is held by NatWest Markets PLC.

What it's used for

• The address space is registered under the netname UK-NATWEST-155-136-0-0-16, indicating a dedicated corporate estate for the financial services division.
• The network announces 61184 IPv4 addresses across 23 prefixes, all within the United Kingdom, while maintaining only 3 observed routing neighbours. This high address-to-neighbour ratio characterizes the AS as an internal corporate network rather than a transit or access provider.

Notable

• All RDAP registrants for the largest prefixes are listed as "Technical Role" under the consistent netname UK-NATWEST-155-136-0-0-16, aligning with the registry holder NatWest Markets PLC.
• The address inventory is finely subdivided into 23 distinct prefixes, ranging from /18s down to /24s, which reflects site-by-site segmentation typical of a large enterprise infrastructure.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 155.136.60.0/22
• 155.136.197.0/24
• 155.136.202.0/23

Upstream networks

• AS32787 Akamai Technologies, Inc.
• AS1273 IDDQD-AS
• AS2856 British Telecommunications Limited

Adjacent networks

• AS32787 Akamai Technologies, Inc.
• AS1273 IDDQD-AS
• AS2856 British Telecommunications Limited

Routing security

• RPKI: 0 valid, 0 invalid and 11 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 32 route objects.
• Listed in as-sets: AS-BTGB-CUST, AS-CWCUSTEU, AS-DEMONCUST, AS-KDDCUSTOMER2, AS-PROLE, AS-TELSTRA-INTL-CUSTOMERS, AS-VSNL-IN, AS1273:AS-CWW, AS24560:AS-TELEMEDIA, AS3491:AS-CUSTOMERS-AP, AS3491:AS-CUSTOMERS-TEST.