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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 | 4,127 |
| 512 |
| 32 |
| 4 |
| AS205359GB | precisely-ltd Precisely Software Ltd | 512 | — | 2 |
| AS211077GB | HO-LECN-DC01 UK Home Office (The Secretary of State for the Home Department) | 512 | — | 2 |
| AS214098GB | hrzn-hosting Horizon Hosting Limited | 512 | 3 | 5 |
| AS205177GB | IVANTI-UK IVANTI UK LIMITED | 512 | — | 1 |
| AS216026GB | Smart-Technology-Advisers Smart Technology Advisers Ltd | 512 | — | 2 |
| AS401568GB | MEMILUS - MEMILUS CREATIVE LLC | 512 | — | 2 |
| AS41596GB | WGSL-AS Willis Group Services Ltd | 512 | — | 2 |
| AS201493GB | NSCEMEA1 Noble Systems UK Ltd | 512 | — | 2 |
| AS59920GB | LUSORY Lusory Limited | 512 | 4.1K | 3 |
| AS211020GB | asrokatansky LOBOS NETWORKING LTD | 512 | — | 2 |
| AS198652GB | SELECTEL-AS Selectel LTD | 512 | — | 2 |
| AS210282GB | FRONTIERDC-AS Frontier Technology Limited | 512 | — | 2 |
| AS203184GB | FNZ-EU FNZ HOLDINGS UK LIMITED | 512 | — | 2 |
| AS60688GB | CSPCORE CSP Partnership | 512 | — | 1 |
| AS28914GB | WIRENINE-AS Wireless Logic Limited | 512 | — | 2 |
| AS61093GB | SC Solution Computers Ltd | 512 | — | 2 |
| AS214314GB | CUSHWAKE-UK2 Cushman & Wakefield Debenham Tie Leung Limited | 512 | — | 2 |
| AS206924GB | BENJOJONET Ben Cartwright-Cox | 512 | 8 | 10 |
| AS41367GB | PSN-AS Wood Group UK Limited | 512 | — | 2 |
| AS3252GB | FBRX-AS Fiberax Networking&Cloud Ltd. | 512 | — | 2 |
| AS214722GB | LHGE Lighthouse Global Europe Limited | 512 | — | 2 |
| AS42053GB | STARLING Starling Bank Limited | 512 | — | 2 |
| AS39592GB | IGX0-AS Benjamin Ashton | 512 | — | 2 |
| AS60898GB | AQUIS-EXCHANGE Aquis Exchange Limited | 512 | — | 2 |
| AS43486GB | MSUI1-AS Mizuho Bank Ltd | 512 | — | 2 |
| AS215981GB | X-Fibre X-Fibre Ltd | 512 | — | 2 |
| AS201301GB | soundmouse-netwise Soundmouse Ltd | 512 | 131.1K | 4 |
| AS41751GB | OCADO OCADO RETAIL LIMITED | 512 | — | 1 |
| AS214661GB | AliceNetwork ALICE NETWORKS LTD | 512 | — | 2 |
| AS199379GB | MARKERSTUDY-AS Markerstudy Insurance Services Limited | 512 | — | 2 |
| AS216338GB | intelegro INTELEGRO LIMITED | 512 | — | 2 |
| AS29754GB | AS29754 Qube Research and Technologies Limited | 512 | — | 2 |
| AS212601GB | Calastone Calastone Limited | 512 | — | 2 |
| AS39150GB | HOSTING-TELECOM-AS HOSTING TELECOM LTD | 512 | 327.7K | 7 |
| AS211675GB | LAYERSHIFT-NETWORKS Layershift Limited | 512 | 65.5K | 2 |
| AS202610GB | NEKO-AS NekoClaw Ltd | 512 | 2 | 4 |
| AS215662GB | KENSINGTON KENSINGTON MORTGAGE COMPANY LIMITED | 512 | — | 2 |
| AS197560GB | VDIS Beeks Financial Cloud Ltd | 512 | — | 2 |
| AS51845GB | WATERSTONS-AS WATERSTONS LIMITED | 512 | — | 2 |
| AS202416GB | DATALORDS Kart Technologies Limited | 512 | 524.3K | 4 |
| AS199262GB | TfL-FPS-AS Transport for London | 512 | — | 1 |
| AS210404GB | TUNSTALL-UK Tunstall Healthcare (UK) Limited | 512 | — | 2 |
| AS41570GB | SSVC-AS BFBS | 512 | — | 2 |
| AS212469GB | GREENCO-ISP ServerHouse Ltd | 512 | — | 1 |
| AS49958GB | EVO-AS Evolution Gaming LTD | 512 | — | 2 |
| AS203767GB | CLARITAS-A Claritas Solutions Limited | 512 | — | 2 |