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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 |
| 7.2M |
| 1.7M |
| 222 |
| AS5607GB | BSKYB-BROADBAND-AS Sky UK Limited | 6.9M | 2.8M | 80 |
| AS5378GB | Vodafone Limited | 2.8M | 524.3K | 24 |
| AS6871GB | Plusnet British Telecommunications Limited | 2.1M | 589.8K | 63 |
| AS8220GB | COLT COLT Technology Services Group Limited | 1.5M | 393.2K | 172 |
| AS212238GB | CDNEXT Datacamp Limited | 1.2M | 42.5M | 4,613 |
| AS206067GB | H3GUK Hutchison 3G UK Limited | 1.1M | 152.6K | 404 |
| AS8426GB | CLARANET-AS Claranet Limited | 910.6K | 2.8M | 105 |
| AS8851GB | EDGE GCI Network Solutions Limited | 824.8K | 1.3M | 351 |
| AS5413GB | Wavenet-AS5413 Wavenet Limited | 740.6K | 1.1M | 108 |
| AS5400GB | BT British Telecommunications Limited | 734.7K | 60.4M | 126 |
| AS31655GB | ASN-GammaTelecom Gamma Telecom Holdings Ltd | 614.4K | 1.6M | 39 |
| AS3300GB | BT British Telecommunications Limited | 604.4K | 195.6K | 152 |
| AS30844GB | LIQUID-AS Liquid Telecommunications Ltd | 545.5K | 671.7K | 309 |
| AS13037GB | ZEN-AS Zen Internet Ltd | 527.6K | 524.3K | 38 |
| AS42689GB | Glide Glide Student & Residential Limited | 506.1K | 1.6M | 378 |
| AS20860GB | IOMART-AS IOMART CLOUD SERVICES LIMITED | 417.8K | 1.1M | 212 |
| AS15395GB | RACKSPACE-LON Rackspace Ltd. | 403.7K | 65.5K | 35 |
| AS62240GB | Clouvider Clouvider Limited | 367.1K | 4.6M | 2,484 |
| AS8468GB | ENTANET Cityfibre Limited | 364.5K | 1.1M | 49 |
| AS35228GB | O2BROADBAND Telefonica UK Limited | 295.2K | 67.6K | 141 |
| AS25180GB | EXPONENTIAL-E-AS Exponential-E Ltd. | 292.9K | 593.9K | 48 |
| AS15914GB | British Airways plc | 288.3K | — | 95 |
| AS8698GB | NATIONWIDE BUILDING SOCIETY | 262.1K | — | 109 |
| AS12390GB | KINGSTON-UK-AS KCOM Group Limited | 260.1K | 131.1K | 20 |
| AS56478GB | BCUBE-AS Hyperoptic Ltd | 253.2K | 77.8K | 171 |
| AS201838GB | ASN-COMMUNITYFIBRE Community Fibre Limited | 238.3K | 1.1M | 104 |
| AS25310GB | ASN-CWACCESS Vodafone Limited | 229.4K | — | 4 |
| AS8607GB | TIMICO Digital Space Group Limited | 205.6K | 720.9K | 24 |
| AS12703GB | PULSANT-AS Pulsant (Scotland) Ltd | 183.6K | 458.8K | 71 |
| AS20712GB | AS20712 Andrews & Arnold Ltd | 157.2K | 86K | 109 |
| AS47474GB | Virtual1 Virtual1 Limited | 153.3K | 65.5K | 17 |
| AS15404GB | COLT Technology Services Group Limited | 146.4K | 69.6K | 156 |
| AS25369GB | BANDWIDTH-AS Hydra Communications Ltd | 144.6K | 655.9K | 293 |
| AS21054GB | UK-NATWEST-AS21054 Natwest Markets PLC | 133.9K | — | 11 |
| AS198864GB | QMW-AC-UK Queen Mary University of London | 132.9K | 65.6K | 7 |
| AS209237GB | NPL-MANG-LTD NPL Management LTD | 131.8K | — | 5 |
| AS8651GB | MUSI MUFG Securities EMEA PLC | 131.3K | — | 10 |
| AS60068GB | CDN77 Datacamp Limited | 131.1K | 19.2K | 503 |
| AS41230GB | ASK4 ASK4 Limited | 122.1K | 3.7M | 23 |
| AS5587GB | ITILITY-LIMITED Itility Limited | 121.9K | 524.3K | 14 |
| AS41354GB | its-tg ITS Technology Group Limited | 119.3K | 528.4K | 45 |
| AS214143GB | skydigital-telecom SKYDIGITAL TELECOM LTD | 117.2K | — | 291 |
| AS42831GB | UKSERVERS-AS UK Dedicated Servers Limited | 114.7K | 721.2K | 279 |
| AS6908GB | DATAHOP Six Degrees Technology Group Limited | 113.2K | 786.4K | 48 |
| AS3223GB | VOXILITY Voxility LLP | 111.4K | 285 | 412 |
| AS13213GB | UK2NET-AS THG HOSTING LIMITED | 111.4K | 1 | 127 |