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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 | 64 |
| AS8220GB | COLT COLT Technology Services Group Limited | 1.5M | 168 |
| AS206067GB | H3GUK Hutchison 3G UK Limited | 1.1M | 340 |
| AS212238GB | CDNEXT Datacamp Limited | 1M | 4,120 |
| 2K |
| — |
| 3 |
| AS207087GB | pay360 Pay360 Ltd | 2K | — | 5 |
| AS203987GB | VYSIION-AS Vysiion Limited | 2K | — | 2 |
| AS208522GB | uk-optimus Optimus Networks LTD | 2K | — | 3 |
| AS34922GB | NETNAMES CSC Administrative Services Limited | 2K | — | 5 |
| AS209738GB | IONFIBRE CURVE INFORMATION TECHNOLOGY LIMITED | 2K | — | 8 |
| AS28729GB | FORD-AS Ford Motor Company Limited | 2K | 1 | 2 |
| AS42880GB | HP-BCRS-UK EntServ UK Limited | 2K | — | 1 |
| AS8942GB | Costar UK Limited | 2K | — | 4 |
| AS35838GB | CCANET CCANET Limited | 2K | — | 1 |
| AS204436GB | KUALO-AS Kualo Limited | 2K | 65.5K | 3 |
| AS47704GB | ACADEMIA-AS Academia Ltd | 2K | 524.3K | 4 |
| AS209611GB | HFLBROADBAND HFLBroadband Ltd | 2K | — | 3 |
| AS21130GB | IOMART-IE IOMART CLOUD SERVICES LIMITED | 2K | 1 | 6 |
| AS47113GB | SLP Suffolk Life Pensions Limited | 2K | — | 1 |
| AS56745GB | KALNET4U Kalnet4u Ltd | 2K | 65.5K | 2 |
| AS59933GB | SENSICAL Sensical Services Limited | 2K | 65.5K | 4 |
| AS60925GB | BPP-ASN BPP Services Limited | 2K | — | 1 |
| AS205309GB | prodec_networks Prodec Networks Ltd | 2K | — | 3 |
| AS215468GB | LOCKBOX LOCKBOX NETWORKS LLP | 2K | — | 8 |
| AS35259GB | APM APM Internet Ltd | 2K | — | 1 |
| AS34746GB | AXA_INSURANCE AXA Insurance UK plc | 2K | — | 1 |
| AS198850GB | HOGARTH-WORLDWIDE WPP PRODUCTION LIMITED | 2K | — | 1 |
| AS34350GB | MANGROUP Man Investments Limited | 2K | — | 5 |
| AS58305GB | SYN-US SYN LTD | 2K | 13 | 21 |
| AS25108GB | IOMART-APAC-AS Iomart Managed Services Limited | 2K | 65.5K | 6 |
| AS199675GB | WGSLEDC Willis Group Services Ltd | 2K | — | 5 |
| AS11856GB | XCONNECT-TECH - XC Technology Holdings LTD | 2K | — | 3 |
| AS42466GB | METEORIC-AS Meteoric Ltd | 2K | — | 1 |
| AS48070GB | DSM DSM (GB) Limited | 2K | 131.1K | 10 |
| AS42775GB | DSRT-NET ADWORLDS TECHNOLOGIES LP | 2K | 1 | 4 |
| AS31223GB | EA-UK-LHR Electronic Arts Limited | 2K | — | 2 |
| AS34499GB | BlackBox-LINX BlackBox Hosting Ltd | 2K | — | 5 |
| AS49694GB | UK-FR-MNLTD Masternaut Limited | 2K | 3 | 11 |
| AS43534GB | CREDITCALL Network Merchants Limited | 2K | — | 5 |
| AS206999GB | oakfordis Oakford Internet Services Ltd | 2K | — | 8 |
| AS49829GB | ADM-ASN ADM COMPUTER SERVICES LIMITED | 2K | — | 3 |
| AS50422GB | RBS-GBM Natwest Markets PLC | 2K | — | 6 |
| AS206547GB | CDK-Global-EU Keyloop Holdings (UK) Limited | 2K | — | 4 |
| AS215262GB | CLOUDNORD-UKNODE-AS Cloud Nord Limited | 2K | 18 | 9 |
| AS34737GB | QinetiQ-ISP Qinetiq Limited | 2K | — | 4 |
| AS201542GB | micloud Mitel Networks Limited | 2K | — | 5 |
| AS200961GB | FWI2-ASN FIL INVESTMENT MANAGEMENT LIMITED | 2K | — | 8 |
| AS44442GB | TelfordWrekinCouncilAS The Borough of Telford and Wrekin Council | 2K | — | 1 |
| AS59836GB | CBRE-EMEA CBRE Limited | 2K | — | 8 |
| AS138177GB | NOMINET-AS-AP-RESMDNS - NOMINET UK | 2K | 9 | 17 |
| AS47685GB | ASN-BOGONS-HEAVY-NORTH Bogons Heavy Industries (North) Ltd | 2K | — | 1 |