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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.
3,143 autonomous systems registered to United Kingdom. Click an AS for detail.
| AS5378GB | Vodafone Limited | 2.8M | 24 |
| AS6871GB | Plusnet British Telecommunications Limited | 2.1M | 63 |
| AS8220GB | COLT COLT Technology Services Group Limited | 1.5M | 172 |
| AS212238GB | CDNEXT Datacamp Limited | 1.2M | 4,613 |
| AS206067GB | H3GUK Hutchison 3G UK Limited | 1.1M | 404 |
| 256 |
| — |
| 1 |
| AS218393GB | FSL-SOFTWARE FSL Software Ltd | 256 | — | 1 |
| AS204942GB | MifiNorx-AS MIFINORX LTD | 256 | — | 1 |
| AS12613GB | FIREBRICK-AS Firebrick Limited | 256 | — | 1 |
| AS218513GB | STPD-NETWORK Joshua Noakes | 256 | 2 | 3 |
| AS219245GB | DECENTRALIA-ASN DECENTRALIA LIMITED | 256 | — | 1 |
| AS206071GB | EA-DE-COLOGNE Electronic Arts Limited | 256 | — | 1 |
| AS203826GB | TRANQUILA-HOST-AS Tranquila-Host ltd. | 256 | — | 1 |
| AS216036GB | TOTALCOMMS-AS Signal Telecom Ltd | 256 | — | 1 |
| AS51303GB | Warsaw IQVIA SOLUTIONS HQ LTD | 256 | — | 1 |
| AS204778GB | PaulLewis Paul Nicholas Lewis | 256 | 1 | 2 |
| AS43059GB | iitss IT Support Services Team Limited | 256 | 1 | 2 |
| AS198353GB | MIMEO-AS Mimeo Limited | 256 | — | 1 |
| AS200280GB | CameronSharp Cameron Sharp | 256 | 1 | 2 |
| AS59529GB | CME-AS-LO2-1 CME Operations Limited | 256 | — | 1 |
| AS207536GB | SEABECKSOLUTIONS-AS SEABECK SOLUTIONS LIMITED | 256 | — | 1 |
| AS206981GB | TeritumDevelopment Christopher Mountford | 256 | 1 | 2 |
| AS196990GB | COMFIRST-AS Shawbrook Bank Limited | 256 | — | 1 |
| AS215419GB | karizanta Karizanta LTD | 256 | 1 | 2 |
| AS51005GB | FOURDINTERACTIVE 4D Interactive Ltd | 256 | — | 1 |
| AS202590GB | HACKLAB Edinburgh Hacklab Ltd | 256 | 1 | 2 |
| AS42359GB | WEMBLEY-AS The Football Association Ltd. | 256 | — | 1 |
| AS58007GB | Witine Witine Limited | 256 | 1 | 2 |
| AS49728GB | HEREFORDSHIRE-COUNCIL Herefordshire Council | 256 | — | 1 |
| AS198222GB | WHC-AS West Herts College | 256 | — | 1 |
| AS214731GB | ETO-AS ETO Networks Limited | 256 | 887 | 43 |
| AS39617GB | CONSULTANCY-ASN Chris Burton | 256 | 1 | 2 |
| AS197320GB | NPA-AS National Pharmacy Association Ltd | 256 | — | 1 |
| AS198711GB | AS_MOVE_BITS_2 We Move Bits LTD | 256 | — | 1 |
| AS201694GB | RethinkTS Rethink Technology Solutions Ltd | 256 | — | 1 |
| AS201375GB | NG-MKDC0 Datazero Ltd. | 256 | — | 1 |
| AS209080GB | ASN-EDFMAN E D & F MAN TECHNOLOGY LIMITED | 256 | — | 1 |
| AS51047GB | TURTLE-NET Turtle Networks Ltd | 256 | — | 1 |
| AS44782GB | UK-FOREX-AS Stratos Markets Limited | 256 | — | 1 |
| AS205705GB | JDL-AS JDL Enterprises Limited | 256 | 2 | 3 |
| AS204826GB | NR-EU-MA3 North Rock Capital Management (UK) LLP | 256 | — | 1 |
| AS41612GB | REDBEE-AS Red Bee Media Limited | 256 | — | 1 |
| AS219227GB | VANISH-CLOUD-AS VANISH CLOUD LTD | 256 | — | 1 |
| AS212486GB | kigen KIGEN (UK) LIMITED | 256 | — | 1 |
| AS218280GB | HILDREY-NET Stephen Hildrey | 256 | 1 | 2 |
| AS205615GB | SSC SS&C Solution Limited | 256 | — | 1 |
| AS39715GB | platinumhedgehog PLATINUM HEDGEHOG CONSULTANCY LIMITED | 256 | — | 1 |
| AS201230GB | PENINSULA-AS Peninsula Business Services Ltd | 256 | — | 1 |
| AS51392GB | FUSIONED Fusioned Ltd | 256 | 65.5K | 2 |
| AS215672GB | MoeChuang-Network MoeChuang Network Limited | 256 | 16 | 2 |
| AS202939GB | CHIMON-NETWORK Chimon Technology Ltd | 256 | 869 | 27 |
| AS49606GB | MCDEU01 MCD Europe Limited | 256 | — | 1 |