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How United Kingdom ranks worldwide on dormant space, the transfer market, routing security and address density.
PeeringDB-registered presence.
APNIC-measured end-user deployment.
Clean prefixes (valid RPKI + IRR, no mismatch).
Cumulative IPv4, IPv6, and ASN allocations to United Kingdom over time.
The largest autonomous systems registered to United Kingdom by IPv4 footprint.
United Kingdom against its land-border neighbours on IPv4, IPv6, AS numbers and per-capita density.
Share of announced address space covered by valid Route Origin Authorizations.
3,132 autonomous systems registered to United Kingdom. Click an AS for detail.
| AS5378GB | Vodafone Limited | 2.8M | 24 |
| AS6871GB | Plusnet British Telecommunications Limited | 2.1M | 64 |
| AS8220GB | COLT COLT Technology Services Group Limited | 1.5M | 173 |
| AS206067GB | H3GUK Hutchison 3G UK Limited | 1.1M | 369 |
| AS212238GB | CDNEXT Datacamp Limited | 1.1M | 4,286 |
| 1K |
| — |
| 1 |
| AS208408GB | KARANYI Karanyi Ltd | 1K | 4 | 8 |
| AS204116GB | HOSTRELAY-AS HOSTRELAY GLOBAL LTD | 1K | — | 4 |
| AS60060GB | AECOM-EMEA AECOM Limited | 1K | — | 1 |
| AS208524GB | VITS-Hosting-Services VITS LIMITED | 1K | — | 1 |
| AS203582GB | mts M-Tech Systems Ltd | 1K | — | 1 |
| AS60851GB | EMIS-AS Egton Medical Information Systems Limited | 1K | — | 2 |
| AS44749GB | Pinnacom-ISP Pinnacom Ltd | 1K | 1M | 10 |
| AS15622GB | uk-frontline Frontline Consultancy and Business Services Limited | 1K | — | 3 |
| AS201664GB | netwarm NetWarm LTD | 1K | — | 4 |
| AS197594GB | REDSTOR-AS Redstor Limited | 1K | — | 4 |
| AS206984GB | lypy Lypy Limited | 1K | 524.3K | 3 |
| AS39414GB | BYTEFETCH ByteFetch Ltd | 1K | — | 1 |
| AS199569GB | Cognizant-EU-AS Cognizant Worldwide Limited | 1K | 65.5K | 3 |
| AS206246GB | Formosa FORMOSA CAPITAL LP | 1K | 131.1K | 6 |
| AS205565GB | BASETELECOMMUNICATIONSLLP Base Telecommunications LLP | 1K | 524.3K | 2 |
| AS205804GB | DELTAV Delta V Technologies Limited | 1K | 65.5K | 10 |
| AS60193GB | wurzel Wurzel Ltd | 1K | 524.3K | 5 |
| AS62244GB | WBTSUK-AS Watch Tower Bible and Tract Society of Britain | 1K | 65.5K | 2 |
| AS197282GB | WGMAST Wood Group UK Limited | 1K | — | 4 |
| AS50882GB | MAXNETT Maxnett Ltd. | 1K | — | 1 |
| AS208330GB | ASBLX BLX Limited | 1K | — | 1 |
| AS213183GB | WHG-LUX WHG Hosting Services Ltd | 1K | — | 3 |
| AS210096GB | Stemconnect Stem Connect LTD | 1K | — | 1 |
| AS44052GB | PRESSCOMPUTER-ASN ICONIC MEDIA SYSTEMS LIMITED | 1K | — | 3 |
| AS208402GB | cerner Cerner Limited | 1K | 128 | 2 |
| AS206690GB | BFC-FR2 Beeks Financial Cloud Ltd | 1K | — | 4 |
| AS57650GB | NOMIOS-ASN Nomios UK&I Limited | 1K | 524.3K | 2 |
| AS204939GB | TAC-COMMUNICATIONS-UK TAC COMMUNICATIONS LTD | 1K | 524.3K | 2 |
| AS44824GB | CALLAGENIX-COLO-LONDON COMMI HOLDINGS LIMITED | 1K | — | 1 |
| AS214437GB | nexgen-eu1 NexGen Cloud Ltd | 1K | — | 3 |
| AS213451GB | CILIXNET-AS Cilix Limited | 1K | 65.5K | 5 |
| AS199946GB | Ctalk Ctalk Limited | 1K | — | 4 |
| AS56670GB | WSCC-AS West Sussex County Council | 1K | — | 2 |
| AS205106GB | PEASOUP Pea Soup Hosting Limited | 1K | — | 3 |
| AS60011GB | MYTHIC-BEASTS-USA Mythic Beasts Ltd | 1K | 131.1K | 6 |
| AS12884GB | DRW-Investments-AS DRW Investments (UK) Limited | 1K | — | 4 |
| AS201024GB | DATAWEBGLOBAL-AS DATAWEB GLOBAL LP. | 1K | — | 2 |
| AS210087GB | ONTIX Ontix Sites No1 Limited | 1K | — | 1 |
| AS39173GB | IFDS-AS SS&C FINANCIAL SERVICES INTERNATIONAL LIMITED | 1K | — | 2 |
| AS204258GB | vive-technologies-ltd Vive Technologies Ltd | 1K | 524.3K | 2 |
| AS205372GB | evrocomuk Evrocom.uk Limited trading as Fiber Zone | 1K | — | 1 |
| AS209899GB | NUBIS zananet Limited | 1K | — | 1 |
| AS207524GB | LONDSTOCK-US London Stock Exchange PLC | 1K | — | 3 |
| AS208307GB | secondmind SECONDMIND LIMITED | 1K | — | 1 |
| AS211912GB | WHG-USE2 WHG Hosting Services Ltd | 1K | — | 4 |
| AS197234GB | stylez STYLEZ AI LTD | 1K | — | 4 |