AS12701 — BARCAP London
AS12701 announces 28 IPv4 prefixes covering 52,992 addresses and 0 IPv6 prefixes.
About this network
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 /20 down to /23.
- Every retrieved record carries the same netname, BARCLAYS-CIBWM, and no organisation name in the registrant field.
- Two blocks come from elsewhere: 167.203.0.0/22 and 93.93.0.0/23.
- The RDAP record for 141.228.144.0/21 could 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 141.228 that 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.
- CIBWM compresses 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.
Announced prefixes
- 93.93.0.0/23
- 141.228.0.0/20
- 141.228.16.0/23
- 141.228.18.0/24
- 141.228.20.0/22
- 141.228.24.0/21
- 141.228.32.0/20
- 141.228.48.0/21
- 141.228.56.0/22
- 141.228.60.0/23
- 141.228.62.0/24
- 141.228.64.0/20
- 141.228.96.0/21
- 141.228.104.0/22
- 141.228.108.0/23
- 141.228.110.0/24
- 141.228.112.0/20
- 141.228.142.0/24
- 141.228.144.0/20
- 141.228.160.0/19
- 141.228.192.0/22
- 141.228.199.0/24
- 141.228.208.0/20
- 141.228.224.0/20
- 167.203.0.0/22
- 167.203.5.0/24
- 167.203.16.0/22
- 167.203.21.0/24
Upstream networks
- AS28690 Barclays Bank PLC
- AS8220 COLT Technology Services Group Limited
- AS32787 Akamai Technologies, Inc.
- AS6453 TATA COMMUNICATIONS (AMERICA) INC
- AS6758 Monaco Telecom S.A.
- AS9498 BHARTI Airtel Ltd.
- AS2914 NTT America, Inc.
- AS55410 Vodafone Idea Ltd
- AS4755 TATA Communications formerly VSNL is Leading ISP
Adjacent networks
BGP / ASN / CIDR
awaiting query
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IPv4
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IPv6
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Search Results
IPv4 Prefixes
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IPv6 Prefixes
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Total Prefixes
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Unique /24s
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⚠ SUSPICIOUS PREFIX ANNOUNCEMENTS DETECTED