AS21301 — RBS-FM-AS

AS21301 announces 5 IPv4 prefixes covering 2,304 addresses and 0 IPv6 prefixes.

About this network

RBS-FM-AS is operated by Natwest Markets PLC.

What it's used for

• The address space carries internal corporate infrastructure, evidenced by netnames such as UK-NATWEST-155-136-0-0-16 and the registrant Technical Role.
• The AS announces 1792 IPv4 addresses across 3 prefixes and maintains 3 observed neighbours, a ratio consistent with a small, self-contained business network rather than a transit or access provider.

Notable

• All three announced prefixes share the same netname UK-NATWEST-155-136-0-0-16 and registrant Technical Role, indicating a unified internal estate.
• The address inventory consists of three blocks within the 155.136.0.0/16 range, specifically 155.136.56.0/22, 155.136.200.0/23, and 155.136.151.0/24.

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

Announced prefixes

• 155.136.56.0/22
• 155.136.144.0/24
• 155.136.146.0/24
• 155.136.151.0/24
• 155.136.200.0/23

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 15 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 87% of announcements registered; 32 route objects.
• Listed in as-sets: AS-BTGB-CUST, AS-CWCUSTEU, AS-KDDCUSTOMER2, AS-PROLE, AS-TELSTRA-INTL-CUSTOMERS, AS1273:AS-CWW.