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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 |
| 512 |
| — |
| 2 |
| AS50287GB | AudatexUK Audatex (UK) Ltd | 512 | 16 | 3 |
| AS60464GB | SUPERNET-UK SUPERNET UK LIMITED | 512 | — | 2 |
| AS208176GB | HYVE-MANAGED-HOSTING Hyve Ltd | 512 | 4 | 4 |
| AS41596GB | WGSL-AS Willis Group Services Ltd | 512 | — | 2 |
| AS50078GB | X-ON X-ON HEALTH LIMITED | 512 | — | 2 |
| AS200623GB | NetBlazer-Ltd NetBlazer Ltd | 512 | 2 | 4 |
| AS60688GB | CSPCORE CSP Partnership | 512 | — | 1 |
| AS219463GB | THEBATTLE-GROUP-LTD THEBATTLE GROUP LTD | 512 | — | 2 |
| AS218316GB | SPACECORE SPACECORE SOLUTION LTD | 512 | 2 | 4 |
| AS198863GB | CUP-AS Cambridge University Press (Holdings) Limited | 512 | — | 1 |
| AS211501GB | HIGHTIDEGROUP-AS High Tide Group Limited | 512 | 524.3K | 4 |
| AS208026GB | LITTLEWOODS LITTLEWOODS LTD | 512 | — | 2 |
| AS199262GB | TfL-FPS-AS Transport for London | 512 | — | 1 |
| AS218805GB | STACKLAYER-NET Stacklayer Communications Limited | 512 | 4.1K | 4 |
| AS211760GB | CCL-LDN Cleveland Clinic London Ltd | 512 | — | 2 |
| AS43669GB | ACSL2 Axia Computer Systems Limited | 512 | — | 2 |
| AS203251GB | AlchemySystems Alchemy Systems International Limited | 512 | — | 1 |
| AS212329GB | NETCRAFT Netcraft Ltd | 512 | 2 | 4 |
| AS198652GB | SELECTEL-AS Selectel LTD | 512 | — | 2 |
| AS216274GB | uk-gigaloch Gigaloch Limited | 512 | 262.1K | 3 |
| AS28715GB | BrassHornComms Brass Horn Communications | 512 | 8.2K | 4 |
| AS212660GB | WHG-DXB1 WHG Hosting Services Ltd | 512 | — | 2 |
| AS203728GB | AS_BAHU BAHU LTD | 512 | 1 | 3 |
| AS207158GB | WORLDCDN Clouvider Limited | 512 | — | 2 |
| AS41751GB | OCADO OCADO RETAIL LIMITED | 512 | — | 1 |
| AS35559GB | SOMEADDRESS Someaddress Networks Ltd | 512 | 2 | 2 |
| AS198071GB | BERCHSOLUTIONS-AS Berch Solutions Limited | 512 | 16 | 3 |
| AS219335GB | COREVANCE-AS COREVANCE LTD | 512 | — | 2 |
| AS219326GB | SULAVIL SULAVI LTD | 512 | — | 2 |
| AS33981GB | TSYS-AS Total System Services Processing Europe Limited | 512 | — | 2 |
| AS205177GB | IVANTI-UK IVANTI UK LIMITED | 512 | — | 1 |
| AS201301GB | soundmouse-netwise Soundmouse Ltd | 512 | 131.1K | 4 |
| AS210924GB | SSDNetworks SSD Networks Limited | 512 | 524.3K | 3 |
| AS207900GB | uk_northrop_2 Northrop Grumman UK Limited | 512 | — | 2 |
| AS42053GB | STARLING Starling Bank Limited | 512 | — | 2 |
| AS214455GB | RETN-AE-AS RETN Limited | 512 | — | 1 |
| AS200682GB | TLC-ASN Trustees of the London Clinic Limited | 512 | — | 2 |
| AS59410GB | BARRITEC Barritel Ltd | 512 | 65.5K | 3 |
| AS47611GB | WMI-UK-LON Warner Music International Services Limited | 512 | — | 2 |
| AS214056GB | FUTURETECH Future Technology Group Ltd | 512 | — | 2 |
| AS214199GB | luxxysystems Johnathan Hine | 512 | 2 | 4 |
| AS214347GB | MDTS-LTD Massive Dynamic Technical Services Limited | 512 | 1 | 3 |
| AS57740GB | HERMES-DATACOMMS Hermes Datacommunications International Limited | 512 | — | 2 |
| AS198142GB | Warrington-AS Warrington Borough Council | 512 | — | 2 |
| AS209735GB | LAGRANGE Lagrange Cloud Technologies Limited | 512 | 3 | 5 |
| AS198104GB | Bush-Broadband-Ltd Bush Broadband Limited | 512 | 524.3K | 3 |