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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 | 63 |
| AS8220GB | COLT COLT Technology Services Group Limited | 1.5M | 171 |
| AS206067GB | H3GUK Hutchison 3G UK Limited | 1.1M | 332 |
| AS8426GB | CLARANET-AS Claranet Limited | 909.3K | 100 |
| 512 |
| — |
| 2 |
| AS56335GB | NOCSULT Nocsult Ltd | 512 | — | 2 |
| AS215821GB | AS215821 London Digital Systems LTD | 512 | 1 | 3 |
| AS203064GB | PURPLECOMPUTING-AS Purple Computing Limited | 512 | — | 1 |
| AS49401GB | BinkNet Bink Group Ltd | 512 | — | 1 |
| AS48397GB | Unipart-AS Unipart Group Limited | 512 | — | 2 |
| AS47611GB | WMI-UK-LON Warner Music International Services Limited | 512 | — | 2 |
| AS210924GB | SSDNetworks SSD Networks Limited | 512 | 524.3K | 3 |
| AS35559GB | SOMEADDRESS Someaddress Networks Ltd | 512 | 2 | 2 |
| AS41367GB | PSN-AS Wood Group UK Limited | 512 | — | 2 |
| AS60898GB | AQUIS-EXCHANGE Aquis Exchange Limited | 512 | — | 2 |
| AS50287GB | AudatexUK Audatex (UK) Ltd | 512 | 16 | 3 |
| AS204550GB | continental-ltd Continental Limited | 512 | 65.5K | 3 |
| AS9090GB | PRNE PR Newswire Europe Ltd. | 512 | — | 2 |
| AS5586GB | MCI-INT Verizon UK Limited | 512 | 32 | 3 |
| AS50078GB | X-ON X-ON HEALTH LIMITED | 512 | — | 2 |
| AS199720GB | icbcs ICBC Standard Bank PLC | 512 | — | 2 |
| AS215854GB | DC-3-PROJECT Exponential-E Ltd. | 512 | — | 2 |
| AS207673GB | UK-PERFORMCONTENT Perform Content Services Limited | 512 | — | 1 |
| AS212660GB | WHG-DXB1 WHG Hosting Services Ltd | 512 | — | 2 |
| AS212601GB | Calastone Calastone Limited | 512 | — | 2 |
| AS48682GB | IPSL IP Space Limited | 512 | — | 2 |
| AS212469GB | GREENCO-ISP ServerHouse Ltd | 512 | — | 1 |
| AS214453GB | jandutech Beon Core Ltd | 512 | — | 2 |
| AS42214GB | GDNS Network Services Ltd. | 512 | 2 | 4 |
| AS51222GB | CMC-MARKETS-PLC CMC MARKETS PLC | 512 | — | 2 |
| AS216274GB | uk-gigaloch Gigaloch Limited | 512 | 262.1K | 3 |
| AS197407GB | CUCE CHINA UNICOM (EUROPE) OPERATIONS LIMITED | 512 | — | 2 |
| AS214309GB | AURORIX Aurorix Gaming Solutions Limited | 512 | 32 | 4 |
| AS208417GB | EONSCOPE SECUREEND LTD | 512 | — | 2 |
| AS43259GB | LEIDOS-UK Leidos Innovations UK LTD | 512 | — | 2 |
| AS212797GB | UK-PERFORMCONTENT Perform Content Services Limited | 512 | — | 1 |
| AS211189GB | ThermoFisher_EU Thermo Electron Ltd | 512 | — | 1 |
| AS205177GB | IVANTI-UK IVANTI UK LIMITED | 512 | — | 1 |
| AS31743GB | IPGGIS-UK-AS Interpublic GIS (UK) Ltd | 512 | 524.3K | 3 |
| AS59410GB | BARRITEC Barritel Ltd | 512 | 65.5K | 3 |
| AS199262GB | TfL-FPS-AS Transport for London | 512 | — | 1 |
| AS56644GB | SYNFS-AS Fundtech Financial Messaging Ltd | 512 | — | 2 |
| AS214722GB | LHGE Lighthouse Global Europe Limited | 512 | — | 2 |
| AS202792GB | CLOUD-TRANSIT Clouvider Limited | 512 | — | 2 |
| AS50656GB | Optix-Software-ASN Optix Software Ltd | 512 | — | 2 |
| AS39592GB | IGX0-AS Benjamin Ashton | 512 | — | 2 |
| AS203251GB | AlchemySystems Alchemy Systems International Limited | 512 | — | 1 |
| AS207900GB | uk_northrop_2 Northrop Grumman UK Limited | 512 | — | 2 |
| AS198071GB | BERCHSOLUTIONS-AS Berch Solutions Limited | 512 | 16 | 3 |
| AS201301GB | soundmouse-netwise Soundmouse Ltd | 512 | 131.1K | 4 |
| AS210415GB | ASVNK00056 LOBOS NETWORKING LTD | 512 | — | 2 |