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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 |
| 19.7K |
| 49.9K |
| 36 |
| AS3170GB | VELOXSERV VeloxServ Communications Ltd | 19.7K | 1.2M | 85 |
| AS42228GB | Brightstar Brightstar Limited | 19.5K | 65.5K | 12 |
| AS198781GB | G3NS Connect Managed Services (UK) Limited | 19.2K | 65.5K | 33 |
| AS29668GB | QUBE vXtream Ltd | 19.2K | 513 | 41 |
| AS43949GB | MMC Marsh Limited | 19.2K | — | 11 |
| AS34066GB | TELAPPLIANT-AS Telappliant Limited | 18.9K | — | 11 |
| AS209693GB | OC-NETWORK OC NETWORKS LIMITED | 18.7K | 5 | 78 |
| AS5500GB | CHESS Chess ICT Ltd | 18.4K | 1.1M | 12 |
| AS6717GB | AS6717 Internet Central Limited | 18.4K | 524.3K | 6 |
| AS29457GB | OPTIONS-AS Options Technology Ltd | 18.2K | 65.5K | 59 |
| AS207569GB | I-SERVERS-NORTH-EU IHOR HOSTING LTD | 18.2K | 4 | 75 |
| AS205975GB | connect-fibre Fibre Assets Ltd | 18.2K | 917.5K | 19 |
| AS207456GB | PANGEA-CONNECTED Pangea Connected Limited | 18.2K | — | 24 |
| AS12488GB | KRYSTAL Krystal Hosting Ltd | 17.9K | 786.4K | 27 |
| AS204800GB | WHG-SGP WHG Hosting Services Ltd | 17.4K | — | 25 |
| AS205090GB | FIRST-SERVER-EUROPE FIRST SERVER LIMITED | 17.4K | 65.5K | 73 |
| AS61124GB | Marstons Marston's Telecoms Limited | 17.4K | 65.5K | 5 |
| AS8613GB | Wavenet-AS8613 Wavenet Limited | 17.4K | 65.5K | 4 |
| AS60377GB | TOOB toob limited | 17.4K | 524.3K | 3 |
| AS5564GB | SOL-AS Brightsolid Online Technology Ltd | 17.4K | 524.3K | 7 |
| AS212683GB | OLILO-AS Olilo UK & Ireland Ltd. | 17.4K | 131.1K | 38 |
| AS29180GB | O2-ONLINE-AS Telefonica UK Limited | 16.9K | — | 24 |
| AS204044GB | Onlyservers Packet Star Networks Limited | 16.9K | 65.5K | 17 |
| AS206134GB | NEKO-AS NEKOBYTE INTERNATIONAL LIMITED | 16.9K | 12.3K | 70 |
| AS204997GB | FIRSTBYTE-AS FIRST SERVER LIMITED | 16.6K | 16 | 81 |
| AS9011GB | The Patent Office | 16.4K | 65.5K | 10 |
| AS33820GB | REED-ELSEVIER-AS RELX GROUP PLC | 16.4K | — | 19 |
| AS213887GB | WAICORE-LTD WAIcore Ltd | 16.4K | 19.2K | 72 |
| AS200876GB | ev-as Evolving Networks Limited | 16.4K | — | 36 |
| AS15654GB | COMINO Civica UK Ltd. | 16.4K | — | 2 |
| AS16334GB | Sureline-Communications-UK Sureline Communications Limited | 16.4K | — | 2 |
| AS49324GB | CITY-NOTTINGHAM-COUNCIL Nottingham City Council | 16.4K | — | 3 |
| AS204222GB | HMRC-AS His Majesty's Revenue and Customs | 16.4K | — | 1 |
| AS21369GB | SEMA-UK-AS Atos IT Services UK Ltd | 16.1K | — | 46 |
| AS64080GB | SYN-UK SYN LTD | 16.1K | 131.1K | 44 |
| AS199614GB | FICITY-AS-01 Fiberocity Ltd | 16.1K | 131.1K | 67 |
| AS48589GB | TIGER Tiger Network Limited | 15.9K | 1 | 12 |
| AS208189GB | UK-SWISH AllPoints Fibre Networks Limited | 15.9K | 131.1K | 11 |
| AS58325GB | BANDWIDTH-ASIA Hydra Communications Ltd | 15.9K | 16 | 22 |
| AS8902GB | IFB CCS Connectivity Limited | 15.6K | 65.5K | 6 |
| AS41107GB | backbone-connect Backbone Connect Limited | 15.6K | 524.3K | 16 |
| AS199713GB | MLL-AS MLL Telecom Ltd. | 15.6K | — | 16 |
| AS51048GB | NEXT-CONNEX WIFINITY LIMITED | 15.6K | 524.3K | 10 |
| AS216139GB | IRONHOST Iron Hosting Centre LTD | 15.4K | 3 | 63 |
| AS43545GB | TELEDATA Datum Datacentres Limited | 15.4K | 65.5K | 20 |
| AS43599GB | NWEWN-AS Broadband N.I. Ltd. | 15.4K | — | 7 |