Autonomous system
AS14864 GREENWICH - NatWest Markets Securities Inc.
Unclassified ARIN
Summary
NatWest Markets Securities
finance business enterprise
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
146.121.20.0/23and146.121.23.0/24carry the netnameGCM-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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 768 addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 2 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS14864- Registry name
- GREENWICH
- Registrant
- NatWest Markets Securities Inc.
- Abuse contact
- richard.fusco@natwestmarkets.com
- Registered
- 2000-02-16
- Last changed
- 2025-03-02
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 3 with no ROA
- ROAs
- 0 authorising AS14864
- ASPA
- no ASPA record
- IRR
- 100% registered · 3 of 3 announcements
- Route objects
- 2 naming AS14864
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 453 networks and 1,846 prefixes, as published 2026-11-11. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere