Autonomous system
AS12701 BARCAP London
Unclassified RIPE
Summary
Barclays
finance enterprise
One bank, one legacy /16, forty separate announcements, nine neighbours.
What it's used for
- Corporate and investment banking networks. 52,480 addresses in 40 IPv4 prefixes, nine observed BGP neighbours, and no IPv6 announced.
Notable
- Nearly every prefix comes out of
141.228.0.0, in sizes from/20down to/23. - Every retrieved record carries the same netname,
BARCLAYS-CIBWM, and no organisation name in the registrant field. - Two blocks come from elsewhere:
167.203.0.0/22and93.93.0.0/23. - The RDAP record for
141.228.144.0/21could not be retrieved. - Eighteen sampled addresses were queried and none returned a name.
Interesting
- Forty announcements from one contiguous block, sent to nine neighbours, is not traffic engineering. It is an internal segmentation plan pushed straight into BGP: each business unit, site or security zone gets its own prefix, and the boundaries that matter inside the bank end up visible to everyone outside it.
- The gaps are as informative as the announcements. The pieces of
141.228that are missing from the routing table are the parts kept off the public Internet, so the shape of what is advertised outlines the shape of what is not. CIBWMcompresses a set of divisions into five letters and then repeats it on every record. A netname that never varies is worth as much as no netname at all for telling blocks apart, which is a reasonable trade when the alternative is publishing an internal org chart.
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.
Transit providers
9 upstream, 0 downstream and 9 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 42 prefixes · 52.99K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| GB | United Kingdom | 42 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS12701- Registry name
- BARCAP
- Registrant
- BC-NET-MNT
- Abuse contact
- abuse@uk.verizon.com
- Registered
- 1970-01-01
- Last changed
- 2023-11-08
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 33 with no ROA
- ROAs
- 0 authorising AS12701
- ASPA
- no ASPA record
- IRR
- 100% registered · 33 of 33 announcements
- Route objects
- 165 naming AS12701
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: 431 networks and 1,768 prefixes, as published 2026-10-12. 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