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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 |
| 256 |
| — |
| 1 |
| AS200468GB | ALVAREZ ALVAREZ & MARSAL DISPUTES AND INVESTIGATIONS LLP | 256 | — | 1 |
| AS41493GB | CHI-X Cboe Europe Limited | 256 | — | 1 |
| AS51498GB | CONNET-AS CONNECTION NETWORKS L.P. | 256 | — | 1 |
| AS212486GB | kigen KIGEN (UK) LIMITED | 256 | — | 1 |
| AS49209GB | CTE-ASN China Telecom Europe Ltd. | 256 | — | 1 |
| AS204055GB | CentralNic-Anycast-H CentralNic Ltd | 256 | 1 | 2 |
| AS21160GB | ASN-MARKEL Markel International Services Ltd | 256 | — | 1 |
| AS39461GB | BE-AS EDF ENERGY NUCLEAR GENERATION LIMITED | 256 | — | 1 |
| AS215003GB | TUBES_AS Internet Tubes LTD | 256 | — | 1 |
| AS212788GB | edgenet Edge Network Technologies Ltd | 256 | — | 1 |
| AS44426GB | SYNECTICS-AS Synectics Solutions Ltd | 256 | — | 1 |
| AS211374GB | McLarenApplied Motion Applied Limited | 256 | — | 1 |
| AS207601GB | EA-FR-LYON Electronic Arts Limited | 256 | — | 1 |
| AS198353GB | MIMEO-AS Mimeo Limited | 256 | — | 1 |
| AS47988GB | PHOTOSOFPICKLES Charles Allom | 256 | 1 | 2 |
| AS207273GB | PHAROAH-AS Pharoah Tools Limited | 256 | — | 1 |
| AS49793GB | IAIN-MCWILLIAMS-AS LMP Technical Services Ltd | 256 | 1 | 2 |
| AS204208GB | Peravix Peravix Group LTD | 256 | 272 | 3 |
| AS199330GB | CENTRALNIC-ANYCAST-A CentralNic Ltd | 256 | 1 | 2 |
| AS31632GB | OAG-AS OAG Aviation WorldWide Limited | 256 | — | 1 |
| AS60758GB | DMC-AS Deluxe UK Holdings Limited | 256 | — | 1 |
| AS204826GB | NR-EU-MA3 North Rock Capital Management (UK) LLP | 256 | — | 1 |
| AS205237GB | SAVILLS-PLC SAVILLS PLC | 256 | — | 1 |
| AS41373GB | BT-Plc NATIONAL HEALTH SERVICE | 256 | — | 1 |
| AS214323GB | MSH-UK Marcus Hughes | 256 | 2 | 3 |
| AS206146GB | PSND-UK PAYSEND TECHNOLOGY LIMITED | 256 | — | 1 |
| AS51005GB | FOURDINTERACTIVE 4D Interactive Ltd | 256 | — | 1 |
| AS207734GB | Quika COMMERCIS ME LTD | 256 | — | 1 |
| AS215322GB | connectcov UK Dedicated Servers Limited | 256 | 65.5K | 2 |
| AS58226GB | PHUSIONIM Phusion IM Limited | 256 | — | 1 |
| AS210812GB | CHRIS-PRITCHARD Christopher Pritchard | 256 | 257 | 3 |
| AS34900GB | CME-AS-LO2-2 CME Operations Limited | 256 | — | 1 |
| AS210025GB | XXSL Alice Cat Research Ltd | 256 | 10 | 11 |
| AS206033GB | REPOXLABS Repox Labs Ltd | 256 | 3 | 4 |
| AS196902GB | DUDLEY-MBC Dudley Metropolitan Borough Council | 256 | — | 1 |
| AS3220GB | INTERNET-TECHNOLOGY-ADVISORS Internet Technology Advisors Scandinavia Ab | 256 | — | 1 |
| AS42875GB | NCP-AS National Car Parks Limited | 256 | — | 1 |
| AS206664GB | FlextradeUK-2 FLEXTRADE UK LIMITED | 256 | — | 1 |
| AS208098GB | GPS THREDD UK LIMITED | 256 | — | 1 |
| AS60894GB | FLOWNET Flownet Solutions Ltd | 256 | 17 | 3 |
| AS29048GB | EQUIDUCT Equiduct Systems Limited | 256 | — | 1 |
| AS60914GB | TelecomsConsortiumLtd Telecoms Consortium Ltd. | 256 | — | 1 |
| AS198628GB | FIDESSA-AS FIDESSA TRADING UK LIMITED | 256 | — | 1 |
| AS53335GB | BCM-US - BlueCrest Capital Management LP | 256 | — | 1 |
| AS201230GB | PENINSULA-AS Peninsula Business Services Ltd | 256 | — | 1 |
| AS43059GB | iitss IT Support Services Team Limited | 256 | 1 | 2 |