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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 |
| AS218641GB | TEECEEY-TECH_AS TEECEEY-TECH LTD | 512 | — | 2 |
| AS197407GB | CUCE CHINA UNICOM (EUROPE) OPERATIONS LIMITED | 512 | — | 2 |
| AS210203GB | RETN-IT-AS RETN Limited | 512 | — | 1 |
| AS219185GB | NARWHAL-NETTECH NARWHAL NETTECH LIMITED | 512 | 3 | 5 |
| AS34623GB | Netegral Astutium Limited | 512 | 1 | 2 |
| AS199262GB | TfL-FPS-AS Transport for London | 512 | — | 1 |
| AS214347GB | MDTS-LTD Massive Dynamic Technical Services Limited | 512 | 1 | 3 |
| AS209765GB | AspireMedia ASPIRE MEDIA GROUP LIMITED | 512 | — | 2 |
| AS35559GB | SOMEADDRESS Someaddress Networks Ltd | 512 | 2 | 2 |
| AS216026GB | Smart-Technology-Advisers Smart Technology Advisers Ltd | 512 | — | 2 |
| AS39592GB | IGX0-AS Benjamin Ashton | 512 | — | 2 |
| AS34930GB | HAL LHR AIRPORTS LIMITED | 512 | — | 2 |
| AS219335GB | COREVANCE-AS COREVANCE LTD | 512 | — | 2 |
| AS401568GB | MEMILUS - MEMILUS CREATIVE LLC | 512 | — | 2 |
| AS211760GB | CCL-LDN Cleveland Clinic London Ltd | 512 | — | 2 |
| AS211189GB | ThermoFisher_EU Thermo Electron Ltd | 512 | — | 1 |
| AS41367GB | PSN-AS Wood Group UK Limited | 512 | — | 2 |
| AS199720GB | icbcs ICBC Standard Bank PLC | 512 | — | 2 |
| AS205359GB | precisely-ltd Precisely Software Ltd | 512 | — | 2 |
| AS203728GB | AS_BAHU BAHU LTD | 512 | 1 | 3 |
| AS56644GB | SYNFS-AS Fundtech Financial Messaging Ltd | 512 | — | 2 |
| AS51823GB | MTNETWORKSLTD Microtalk Europe Ltd | 512 | — | 2 |
| AS50632GB | NU-COLO-NET Fish.Net Limited | 512 | — | 1 |
| AS198142GB | Warrington-AS Warrington Borough Council | 512 | — | 2 |
| AS137037GB | VEBBLEPVTLTD-AS-AP - VEBBLE PVT LTD. | 512 | 1 | 3 |
| AS201301GB | soundmouse-netwise Soundmouse Ltd | 512 | 131.1K | 4 |
| AS208176GB | HYVE-MANAGED-HOSTING Hyve Ltd | 512 | 4 | 4 |
| AS218316GB | SPACECORE SPACECORE SOLUTION LTD | 512 | 2 | 4 |
| AS218774GB | UC-AS uno Ltd. | 512 | 65.5K | 2 |
| AS43669GB | ACSL2 Axia Computer Systems Limited | 512 | — | 2 |
| AS203251GB | AlchemySystems Alchemy Systems International Limited | 512 | — | 1 |
| AS205177GB | IVANTI-UK IVANTI UK LIMITED | 512 | — | 1 |
| AS60464GB | SUPERNET-UK SUPERNET UK LIMITED | 512 | — | 2 |
| AS50078GB | X-ON X-ON HEALTH LIMITED | 512 | — | 2 |
| AS48682GB | IPSL IP Space Limited | 512 | — | 2 |
| AS33975GB | NETCONSULT-AS NetConsult Ltd | 512 | — | 1 |
| AS41596GB | WGSL-AS Willis Group Services Ltd | 512 | — | 2 |
| AS214455GB | RETN-AE-AS RETN Limited | 512 | — | 1 |
| AS50287GB | AudatexUK Audatex (UK) Ltd | 512 | 16 | 3 |
| AS207520GB | EXODUSPOINT-CAPITAL-MANAGEMENT-UK ExodusPoint Capital Management UK, LLP | 512 | — | 2 |
| AS50656GB | Optix-Software-ASN Optix Software Ltd | 512 | — | 2 |
| AS49313GB | SEVAHOST-AS Seva-Host Ltd | 512 | — | 2 |
| AS214722GB | LHGE Lighthouse Global Europe Limited | 512 | — | 2 |
| AS212797GB | UK-PERFORMCONTENT Perform Content Services Limited | 512 | — | 1 |
| AS5586GB | MCI-INT Verizon UK Limited | 512 | 32 | 3 |
| AS51692GB | HyberHost Steven Smith trading as HyberHost | 512 | 33 | 5 |