Home ASN LookupAS21369

AS21369 SEMA-UK-AS Atos IT Services UK Ltd

🇬🇧

Org handle: ORG-AISU1-RIPE

RIPE NCCallocated

Announced Prefixes (BGP)

46total

46 IPv40 IPv6

IPv4 Addresses

Allocated (RIR)65,536

Announced (BGP)16,128

IPv6 Addresses

Allocated (RIR)0

Announced (BGP)0

Prefix Limit (IPv4)

100

Prefix Limit (IPv6)

Country

🇬🇧 GB

RIR

RIPE NCC

Status

allocated

Allocated

2001-11-15

Announced Prefixes

(BGP)46

Prefix	RPKI	IRR	Last Seen
157.203.6.0/23	Valid	RIPE	2026-10-11
157.203.6.0/24	Valid	RIPE	2026-10-11
157.203.7.0/24	Valid	RIPE	2026-10-11
157.203.36.0/23	Valid	RIPE	2026-10-11
157.203.36.0/24	Valid	RIPE	2026-10-11
157.203.37.0/24	Valid	RIPE	2026-10-11
157.203.40.0/23	Valid	RIPE	2026-10-11
157.203.40.0/24	Valid	RIPE	2026-10-11
157.203.41.0/24	Valid	RIPE	2026-10-11
157.203.42.0/23	Valid	RIPE	2026-10-11

1-10 of 46

1 / 5

Allocated Prefixes

(RIR)1

Prefix	Country	RIR	Status
157.203.0.0/16	🇬🇧 GB	RIPENCC	allocated

All 46 announced prefixes of AS21369 →

BGP Neighbours

(seen in AS paths)

Upstreams (4)

Networks AS21369 hands its own prefixes to: transit providers, or peers at an exchange.

AS198949Radware29
AS8220COLT Technology Services Group Limited8
AS2856BT UK British Telecommunications Limited7
AS702Verizon Business2

ASPA

No ASPA

Abuse Contact

External Links

RIPE Whois RIPEstat

Learn more

What is an ASN?Autonomous systems, ASN ranges and how they are assigned
RPKI and route origin validationWhat the RPKI badges on the prefix list mean
ASPA explainedWhy AS21369 should publish an ASPA object
IPv4 transfers in the RIPE NCC regionMonthly volume and the latest registry transfers
ASN data in AI agents and SIEMMCP server and API integrations

API

Open

GEThttps://api.ipctl.io/v1/asn/21369

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/21369" | jq