Autonomous System
AS21369 — SEMA-UK-AS - Atos IT Services UK Ltd(GB)
Last fetched
AS21369 is an Autonomous System operated by SEMA-UK-AS - Atos IT Services UK Ltd and registered in GB. As of Sun, 06 Sep 2026 13:08:34 GMT, it announces 46 routed IP prefixes and peers with 4 other Autonomous Systems in the WhisperGraph BGP dataset.
Nutrition Label
Routing footprint
AS21369 announces 46 distinct routed prefixes. The 25-prefix sample below links to per-prefix pages with full conflict and reverse-DNS detail.
- 157.203.6.0/24
- 157.203.6.0/23
- 157.203.7.0/24
- 157.203.36.0/24
- 157.203.36.0/23
- 157.203.37.0/24
- 157.203.40.0/24
- 157.203.40.0/23
- 157.203.41.0/24
- 157.203.42.0/24
- 157.203.42.0/23
- 157.203.43.0/24
- 157.203.48.0/24
- 157.203.48.0/23
- 157.203.49.0/24
- 157.203.52.0/24
- 157.203.52.0/23
- 157.203.53.0/24
- 157.203.56.0/24
- 157.203.56.0/23
- 157.203.57.0/24
- 157.203.58.0/23
- 157.203.59.0/24
- 157.203.60.0/24
- 157.203.60.0/23
Peering ecosystem
4 distinct peers via BGP. The first 4 are listed below.
Blast radius
Count of dependent hostnames if AS21369 disappeared from the routing table.
387 hostnames depend on this network.Exact count across all 46 announced prefixes. Snapshot Tue, 07 Jul 2026 09:00:43 GMT.
MOAS / hijack watch
Prefixes routed by AS21369 that another Autonomous System also announces. A non-empty list is one of the strongest BGP-hijack signals available without active probes.
No active MOAS conflicts. Every prefix announced by AS21369 is unique to AS21369 in the current routing snapshot.
Threat posture
Related pages
Pivot deeper into the graph from AS21369.
Cypher and MCP
Reproduce the headline metric directly against graph.whisper.security:
MATCH (a:ASN {name: "AS21369"})-[:HAS_NAME]->(n:ASN_NAME)
OPTIONAL MATCH (a)-[:HAS_COUNTRY]->(c:COUNTRY)
RETURN a.name AS asn, n.name AS operator, c.name AS countryOr query Whisper from your own LLM workflow via the Whisper MCP server.