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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 |
| 5.6K |
| 524.3K |
| 7 |
| AS198798GB | OFLI-AS OFFICE LIMITED | 5.6K | 2 | 13 |
| AS44403GB | BRISTOL-CITY-COUNCIL Bristol City Council | 5.6K | — | 8 |
| AS59816GB | BLYNX 4on LTD | 5.9K | 524.3K | 11 |
| AS30931GB | IGINDEX-PLC IG Index Ltd. | 5.9K | 524.3K | 19 |
| AS212109GB | SQUIRREL Squirrel Internet Ltd | 5.9K | 131.1K | 12 |
| AS212581GB | BIDFX SGX FX SYSTEMS UK LIMITED | 5.9K | — | 14 |
| AS59455GB | CSG-AS Clearstream Technology ltd | 5.9K | 524.3K | 11 |
| AS59895GB | BINARYRACKS-AS Binary Racks Limited | 6.1K | 65.5K | 29 |
| AS197574GB | EXPRESSHOST ExpressHost Ltd | 6.1K | 4 | 28 |
| AS219064GB | Akenai-Products-AS Akenai Products LTD | 6.1K | 6 | 27 |
| AS47890GB | UNMANAGED-DEDICATED-SERVERS UNMANAGED LTD | 6.1K | 3 | 27 |
| AS25582GB | ASN-LINIX NWIP Ltd | 6.1K | 524.3K | 9 |
| AS9086GB | ASN-DOCKLANDS-DATA-CENTRE-LTD Docklands Data Centre Ltd | 6.1K | — | 9 |
| AS42344GB | CC-AS Subtopia Ltd | 6.1K | 589.8K | 5 |
| AS21470GB | SWISP-AS South West Communications Group Ltd | 6.1K | — | 2 |
| AS197039GB | NOMURA-NET1-AS1 Nomura International Plc | 6.1K | — | 24 |
| AS48254GB | TWENTYI 20i Limited | 6.1K | 14 | 38 |
| AS35399GB | ITIO-AS Online50 Limited | 6.1K | 65.5K | 12 |
| AS34967GB | DRD-AS DRD Communications Limited | 6.1K | — | 14 |
| AS61097GB | Cloudsoftcat Softcat PLC | 6.1K | 65.5K | 9 |
| AS202013GB | MIL-POP Mobile Internet Limited | 6.1K | — | 21 |
| AS28780GB | PCMS-AS Flooid limited | 6.1K | — | 2 |
| AS199283GB | UKSCOMMS-AS STRUCTURED COMMUNICATIONS LIMITED | 6.1K | 524.3K | 24 |
| AS42353GB | SIMWOOD Simwood eSMS Limited | 6.4K | — | 16 |
| AS51055GB | BRIDGEP-AS Bridge Fibre Limited | 6.4K | 131.1K | 9 |
| AS205771GB | OCTAPLUSUK OCTAPLUS NETWORKS LTD | 6.4K | 196.6K | 12 |
| AS34587GB | HLM2-AS Hillside (Technology) Ltd | 6.4K | — | 25 |
| AS212171GB | Local-as Local NCC Ltd. | 6.4K | — | 24 |
| AS56474GB | CCDCUK Computacenter (UK) Ltd | 6.4K | — | 13 |
| AS60800GB | NHL-AS1 Netwise Hosting Ltd | 6.7K | 524.3K | 9 |
| AS29016GB | PEARSON-EMEA Pearson Shared Services Ltd | 6.7K | — | 10 |
| AS31220GB | CARRENZA-AS Six Degrees Technology Group Limited | 6.7K | — | 13 |
| AS213169GB | Catixs-Edge Catixs Ltd | 6.7K | — | 10 |
| AS25562GB | SCEE Sony Interactive Entertainment Europe Limited | 6.9K | — | 24 |
| AS201971GB | CreeperHostLTD-AS CreeperHost LTD | 6.9K | 193 | 27 |
| AS56396GB | Amobee NEXXEN GROUP LTD | 6.9K | 1 | 7 |
| AS29606GB | Borwood-AS Borwood Ltd | 7.2K | 65.5K | 11 |
| AS197898GB | IDSI Integrated Digital Services Ltd | 7.2K | 131.1K | 7 |
| AS218964GB | QUATTRO-AS QUATTRO APPS LTD | 7.2K | — | 28 |
| AS204167GB | hyve Hyve Ltd | 7.2K | 7 | 19 |
| AS204558GB | ODYSSEY Odyssey Systems Ltd | 7.2K | 65.5K | 5 |
| AS44369GB | EMBC-EMPSN-AS emPSN Services Limited | 7.4K | — | 5 |
| AS25460GB | TNP-AS The Networking People (TNP) Limited | 7.4K | 65.5K | 10 |
| AS48950GB | GLOBALCOLOCATION Global Custom Data Limited | 7.4K | — | 29 |
| AS202051GB | NETGRID-HOST-LT NETGRID HOST LTD | 7.4K | — | 29 |
| AS35071GB | UK-XOOM-SYSTEMS-AS Xoom Limited | 7.4K | — | 10 |