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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.
3,123 autonomous systems registered to United Kingdom. Click an AS for detail.
| AS5378GB | Vodafone Limited | 2.8M | 24 |
| AS6871GB | Plusnet British Telecommunications PLC | 2.1M | 63 |
| AS8220GB | COLT COLT Technology Services Group Limited | 1.5M | 171 |
| AS206067GB | H3GUK Hutchison 3G UK Limited | 1.1M | 331 |
| AS8426GB | CLARANET-AS Claranet Limited | 909.3K | 100 |
| 256 |
| 1 |
| 2 |
| AS44782GB | UK-FOREX-AS Stratos Markets Limited | 256 | — | 1 |
| AS198222GB | WHC-AS West Herts College | 256 | — | 1 |
| AS21160GB | ASN-MARKEL Markel International Services Ltd | 256 | — | 1 |
| AS214451GB | R3ido101 Oliver Reid | 256 | 131.1K | 6 |
| AS21464GB | EDF-AS EDF Trading Ltd | 256 | — | 1 |
| AS209015GB | TenTime-AS Ten Time Limited | 256 | — | 1 |
| AS212486GB | kigen KIGEN (UK) LIMITED | 256 | — | 1 |
| AS205936GB | ASCOULDIT COULD IT HOSTING LIMITED | 256 | — | 1 |
| AS206800GB | EA-SE-STOCKHOLM Electronic Arts Limited | 256 | — | 1 |
| AS28934GB | MIZUHO-AS Mizuho International Plc | 256 | — | 1 |
| AS204942GB | MifiNorx-AS MIFINORX LTD | 256 | — | 1 |
| AS213692GB | CSCM CSCM Limited | 256 | 524.3K | 2 |
| AS199794GB | EMO-AS EMOCLOUD LTD | 256 | 272 | 3 |
| AS60079GB | EMF-AS Electromagnetic Field Ltd. | 256 | 1 | 2 |
| AS197106GB | TRPI-EU-AS T. Rowe Price International LTD | 256 | — | 1 |
| AS60698GB | LINXNETWORKS Linx-Networks-UK Ltd | 256 | — | 1 |
| AS203105GB | BlahajInternet Blahaj Internet Ltd | 256 | 1 | 2 |
| AS56438GB | LOOPSCORPIO-AS Loop Scorpio Ltd | 256 | — | 1 |
| AS214770GB | RGN RGN Holding Ltd. | 256 | 34 | 5 |
| AS202587GB | UMOJA-AS C2C Ltd | 256 | — | 1 |
| AS213016GB | holker-network-solutions Holker Network Solutions Ltd | 256 | — | 1 |
| AS215252GB | LANTEC-AS Lantec Services Ltd | 256 | 1 | 2 |
| AS41373GB | BT-Plc NATIONAL HEALTH SERVICE | 256 | — | 1 |
| AS203001GB | GateX GateX LIMITED | 256 | 1 | 2 |
| AS209080GB | ASN-EDFMAN E D & F MAN TECHNOLOGY LIMITED | 256 | — | 1 |
| AS205615GB | SSC SS&C Solution Limited | 256 | — | 1 |
| AS5464GB | NETD ZURICH DATACENTER LTD | 256 | — | 1 |
| AS50391GB | DIVERGENT DIVERGENT NETWORKS LTD | 256 | 65.6K | 5 |
| AS197284GB | K3X-MNT K3X SYSTEMS Ltd | 256 | 1 | 2 |
| AS200473GB | Samsung-MSK-AS Samsung SDS Europe Ltd | 256 | — | 1 |
| AS198219GB | CHARLIE-AS Charlie Camilleri | 256 | 10 | 4 |
| AS43079GB | Matchtech MATCHTECH GROUP (UK) LIMITED | 256 | — | 1 |
| AS204055GB | CentralNic-Anycast-H CentralNic Ltd | 256 | 1 | 2 |
| AS210938GB | whitbread Whitbread Group PLC | 256 | — | 1 |
| AS209997GB | securitas-uk-as-sms SECURITAS TECHNOLOGY LIMITED | 256 | — | 1 |
| AS56929GB | WBC-NET WANDSWORTH-BOROUGH-COUNCIL | 256 | — | 1 |
| AS214323GB | MSH-UK Marcus Hughes | 256 | 2 | 3 |
| AS51692GB | HyberHost Steven Smith trading as HyberHost | 256 | 19 | 5 |
| AS209750GB | MBX-AS MBX DIGITAL LIMITED | 256 | — | 1 |
| AS201357GB | DPNET-FAST DPNET FAST RELIABLE HOSTING VPS CLOUD SOLUTIONS LTD | 256 | — | 1 |
| AS201676GB | WAGHORN-CAPITAL-CO WAGHORN CAPITAL CO LTD | 256 | — | 1 |
| AS210456GB | EastCostHosting EastCoastHost Ltd | 256 | 1 | 2 |
| AS209220GB | AblativeHosting Ablative Hosting Ltd | 256 | 1 | 2 |
| AS58117GB | TOUCHTEC TouchTec Technology Limited | 256 | — | 1 |
| AS47744GB | ANNECTO-AS XTEND SOLUTIONS LTD | 256 | — | 1 |
| AS34900GB | CME-AS-LO2-2 CME Operations Limited | 256 | — | 1 |