AS14864 — GREENWICH - NatWest Markets Securities Inc.

AS14864 announces 2 IPv4 prefixes covering 768 addresses and 0 IPv6 prefixes.

About this network

The handle is a name the firm no longer trades under, and the netname is that name's initials.

What it's used for

• An investment bank's network. 768 addresses across two IPv4 prefixes, with two observed BGP neighbours and no IPv6 announced.

Notable

• The AS handle is GREENWICH, while the registrant is the current bank name.
• Both 146.121.20.0/23 and 146.121.23.0/24 carry the netname GCM-NET.
• Those two blocks leave a gap between them, so the space in the middle is held or announced elsewhere.
• Six addresses were queried for reverse DNS and none returned a name.

Interesting

• Two records, two eras. The handle is the firm's old identity spelled out, the netname is the same identity reduced to initials, and only the registrant was ever updated to say who owns this now. An AS handle is close to impossible to change once other people have written it into their configurations, so it outlives the brand it was named for.
• Investment banks acquire each other more often than they renumber. Every one of these fossil names marks a transaction, and the routing kept working through all of them, which is the point.
• The gap between the two announcements is worth noticing. A firm holding a contiguous range and announcing only parts of it is either keeping the rest internal or has moved it to a different number.
• Nothing published in reverse DNS, two upstreams, and 768 addresses is a very small public surface for a business of this size.

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

Announced prefixes

• 146.121.20.0/23
• 146.121.23.0/24

Upstream networks

• AS54004 Cablevision Lightpath LLC
• AS46887 Crown Castle Fiber LLC

Adjacent networks

• AS54004 Cablevision Lightpath LLC
• AS46887 Crown Castle Fiber LLC

Routing security

• RPKI: 0 valid, 0 invalid and 3 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 0% of announcements registered; 2 route objects.
• Listed in as-sets: AS-CCF, AS-CCF-TEST, AS-CV, AS-XO-B, AS12025:AS-CUSTOMERS, AS6128:AS-CUSTOMERS.