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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 | 64 |
| AS8220GB | COLT COLT Technology Services Group Limited | 1.5M | 168 |
| AS206067GB | H3GUK Hutchison 3G UK Limited | 1.1M | 340 |
| AS212238GB | CDNEXT Datacamp Limited | 1M | 4,120 |
| 1K |
| — |
| 4 |
| AS204116GB | HOSTRELAY-AS HOSTRELAY GLOBAL LTD | 1K | — | 4 |
| AS44052GB | PRESSCOMPUTER-ASN ICONIC MEDIA SYSTEMS LIMITED | 1K | — | 3 |
| AS209113GB | PRECEDENCE Precedence Technologies Ltd | 1K | — | 3 |
| AS56637GB | Fixnetix Fixnetix Ltd | 1K | — | 3 |
| AS60193GB | wurzel Wurzel Ltd | 1K | 524.3K | 5 |
| AS57650GB | NOMIOS-ASN Nomios UK&I Limited | 1K | 524.3K | 2 |
| AS206984GB | lypy Lypy Limited | 1K | 524.3K | 3 |
| AS207827GB | CSL-IOT CSL (DualCom) Limited | 1K | — | 3 |
| AS201867GB | OXAGON-AS OXAGON LIMITED | 1K | — | 4 |
| AS207245GB | DSTI-ASN DSTI Holdings Limited | 1K | — | 1 |
| AS203573GB | tmcs Tailor Made Technologies Ltd | 1K | — | 1 |
| AS214116GB | AcoraAPC2-AS Acora Limited | 1K | — | 1 |
| AS208402GB | cerner Cerner Limited | 1K | 128 | 2 |
| AS206681GB | IVISTA Ivista Limited | 1K | 524.3K | 2 |
| AS205734GB | TRAPOC Copart UK Limited | 1K | — | 4 |
| AS209447GB | RETN-TR-AS RETN Limited | 1K | — | 1 |
| AS49868GB | ANITE-TRAVEL-SYSTEMS ANITE TRAVEL Ltd | 1K | — | 3 |
| AS203449GB | HOPEWISER-MERLIN Hopewiser Ltd | 1K | 65.5K | 2 |
| AS210279GB | DMT DIGITAL MEDIA TECHNOLOGIES LTD | 1K | — | 1 |
| AS201903GB | EVORIO-AS Evorio Limited | 1K | — | 1 |
| AS198723GB | UNI-READING University of Reading | 1K | 1 | 4 |
| AS50468GB | CITRUS-AS CITRUS TELECOMMUNICATIONS LTD | 1K | — | 4 |
| AS60851GB | EMIS-AS Egton Medical Information Systems Limited | 1K | — | 2 |
| AS131222GB | UK-ALPHA GamerDating Ltd | 1K | — | 4 |
| AS208804GB | Technological Technological Services Limited | 1K | — | 4 |
| AS205402GB | INTERCITY-TECH-THN Intercity Technology Ltd | 1K | — | 4 |
| AS204258GB | vive-technologies-ltd Vive Technologies Ltd | 1K | 524.3K | 2 |
| AS202212GB | DWEBS-AS DWebs Ltd | 1K | 65.5K | 2 |
| AS208833GB | MYCOMMS MyComms Ltd | 1K | — | 1 |
| AS49440GB | plustel PLUSTEL LIMITED | 1K | 65.5K | 2 |
| AS209899GB | NUBIS zananet Limited | 1K | — | 1 |
| AS34344GB | THE-PORT-OF-TILBURY-LONDON-LTD Port Of Tilbury London Ltd | 1K | — | 3 |
| AS210805GB | openinfra-isp-production-uk Open Infra ltd | 1K | 65.5K | 5 |
| AS51318GB | STANDARD-CHARTERED-BANK-AS STANDARD CHARTERED BANK | 1K | — | 4 |
| AS205767GB | Spectron-Services Spectron Services Limited | 1K | — | 1 |
| AS205372GB | evrocomuk Evrocom.uk Limited trading as Fiber Zone | 1K | — | 1 |
| AS50510GB | CRUK-AS Cancer Research UK | 1K | — | 4 |
| AS39610GB | LCH-CLEARNET LCH Group Holdings Limited | 1K | — | 3 |
| AS203861GB | MITEFLUX-AS Miteflux Technologies Ltd | 1K | — | 4 |
| AS204236GB | uk-div011 Daniel Ionita | 1K | — | 1 |
| AS208307GB | secondmind SECONDMIND LIMITED | 1K | — | 1 |
| AS204247GB | ASDA-UK-AS Asda Stores Limited | 1K | — | 1 |
| AS205996GB | Interfiber Interfiber Ltd | 1K | 65.5K | 2 |
| AS59439GB | VOICEFACTORY-AS EvolveIP LTD | 1K | 0 | 2 |
| AS60333GB | UOMCOMM The University of Manchester | 1K | — | 1 |
| AS29164GB | IOMARTHOSTING-EU Iomart Group Plc | 1K | 65.5K | 5 |