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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.
3,134 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 | 368 |
| AS212238GB | CDNEXT Datacamp Limited | 1.1M | 4,290 |
| 15.9K |
| 131.1K |
| 11 |
| AS199614GB | FICITY-AS-01 Fiberocity Ltd | 16.1K | 131.1K | 67 |
| AS205090GB | FIRST-SERVER-EUROPE FIRST SERVER LIMITED | 16.1K | 65.5K | 67 |
| AS64080GB | SYN-UK SYN LTD | 16.1K | 131.1K | 44 |
| AS21369GB | SEMA-UK-AS Atos IT Services UK Ltd | 16.1K | — | 46 |
| AS200876GB | ev-as Evolving Networks Limited | 16.4K | — | 36 |
| AS197545GB | Era4-ASN Era4 Limited | 16.4K | 65.5K | 2 |
| AS16334GB | Sureline-Communications-UK Sureline Communications Limited | 16.4K | — | 2 |
| AS49324GB | CITY-NOTTINGHAM-COUNCIL Nottingham City Council | 16.4K | — | 3 |
| AS9011GB | The Patent Office | 16.4K | 65.5K | 10 |
| AS33820GB | REED-ELSEVIER-AS RELX GROUP PLC | 16.4K | — | 19 |
| AS15654GB | COMINO Civica UK Ltd. | 16.4K | — | 2 |
| AS204222GB | HMRC-AS His Majesty's Revenue and Customs | 16.4K | — | 1 |
| AS204997GB | FIRSTBYTE-AS FIRST SERVER LIMITED | 16.4K | 16 | 80 |
| AS207569GB | I-SERVERS-NORTH-EU IHOR HOSTING LTD | 16.6K | 4 | 69 |
| AS60377GB | TOOB toob limited | 17.4K | 524.3K | 3 |
| AS204800GB | WHG-SGP WHG Hosting Services Ltd | 17.4K | — | 25 |
| AS8613GB | Wavenet-AS8613 Wavenet Limited | 17.4K | 65.5K | 4 |
| AS61124GB | Marstons Marston's Telecoms Limited | 17.4K | 65.5K | 5 |
| AS5564GB | SOL-AS Brightsolid Online Technology Ltd | 17.4K | 524.3K | 7 |
| AS12488GB | KRYSTAL Krystal Hosting Ltd | 17.9K | 786.4K | 27 |
| AS205975GB | connect-fibre Fibre Assets Ltd | 18.2K | 917.5K | 19 |
| AS29457GB | OPTIONS-AS Options Technology Ltd | 18.2K | 65.5K | 59 |
| AS207456GB | PANGEA-CONNECTED Pangea Connected Limited | 18.2K | — | 24 |
| AS6717GB | AS6717 Internet Central Limited | 18.4K | 524.3K | 6 |
| AS34066GB | TELAPPLIANT-AS Telappliant Limited | 18.9K | — | 11 |
| AS199741GB | TRANSITX-BYOIP-Customers TransitX Ltd | 18.9K | 1 | 72 |
| AS45014GB | NCONNECT Nuco Technologies Ltd | 19.2K | 49.9K | 35 |
| 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 |
| AS42228GB | Brightstar Brightstar Limited | 19.5K | 65.5K | 12 |
| AS3170GB | VELOXSERV VeloxServ Communications Ltd | 19.5K | 1.2M | 83 |
| AS51551GB | CAPITA-AS Capita Business Services Ltd | 19.7K | — | 4 |
| AS216127GB | NUXT-AS INTERNATIONAL HOSTING COMPANY LIMITED | 20K | 4.1K | 83 |
| AS60819GB | SAFENAMES-AS Safenames Ltd. | 20K | 65.5K | 64 |
| AS28757GB | ASN-SCOTNET Scotnet.co.uk Ltd | 20K | — | 11 |
| AS13205GB | British Telecommunications Limited | 20.2K | — | 14 |
| AS50131GB | SPARTANHOST Spartan Host Ltd | 20.2K | 24.6K | 102 |
| AS210546GB | CHSL-ONE CHSL ONE LTD | 20.5K | 4.1K | 81 |
| AS13126GB | SMS-NET Satellite Mediaport Services Ltd. | 20.5K | 524.3K | 18 |
| AS51263GB | COUNTYBB County Broadband Ltd | 20.5K | 524.3K | 15 |
| AS12496GB | IDNET Infinity Developments Limited | 21K | 65.5K | 8 |
| AS31273GB | AS-BISTECH Bistech Managed Services Ltd | 21K | 65.5K | 10 |
| AS216138GB | SKYQUANTUM-TELECOM SKYQUANTUM TELECOM LTD. | 21K | 1.8M | 105 |
| AS30967GB | TRUPHONE-LTD TP Global Operations Limited | 21.2K | — | 29 |
| AS20705GB | HSBC-UK HSBC Bank plc | 21.5K | 6 | 33 |