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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 |
| 6.7K |
| — |
| 10 |
| AS8916GB | PORTFAST Portfast Ltd | 6.7K | 524.3K | 6 |
| AS31220GB | CARRENZA-AS Six Degrees Technology Group Limited | 6.7K | — | 13 |
| AS34587GB | HLM2-AS Hillside (Technology) Ltd | 6.4K | — | 25 |
| AS51055GB | BRIDGEP-AS Bridge Fibre Limited | 6.4K | 131.1K | 9 |
| AS205771GB | OCTAPLUSUK OCTAPLUS NETWORKS LTD | 6.4K | 196.6K | 12 |
| AS201988GB | VPSPay-ASN VPSPay Networks LTD | 6.4K | — | 23 |
| AS59895GB | BINARYRACKS-AS Binary Racks Limited | 6.4K | 65.8K | 31 |
| AS199550GB | HIRAGI-LTD HIRAGI LTD | 6.4K | — | 25 |
| AS43872GB | OPTINET Optinet U.K. Limited | 6.4K | 3.7M | 23 |
| AS56474GB | CCDCUK Computacenter (UK) Ltd | 6.4K | — | 13 |
| AS42332GB | TSC EKCO LONDON LIMITED | 6.1K | 524.3K | 6 |
| AS35399GB | ITIO-AS Online50 Limited | 6.1K | 65.5K | 12 |
| AS42344GB | CC-AS Subtopia Ltd | 6.1K | 589.8K | 5 |
| AS28780GB | PCMS-AS Flooid limited | 6.1K | — | 2 |
| AS21470GB | SWISP-AS South West Communications Group Ltd | 6.1K | — | 2 |
| AS50889GB | GFN-EMEA NVIDIA Ltd | 6.1K | — | 24 |
| AS199283GB | UKSCOMMS-AS STRUCTURED COMMUNICATIONS LIMITED | 6.1K | 524.3K | 24 |
| AS9086GB | ASN-DOCKLANDS-DATA-CENTRE-LTD Docklands Data Centre Ltd | 6.1K | — | 9 |
| AS61097GB | Cloudsoftcat Softcat PLC | 6.1K | 65.5K | 9 |
| AS25582GB | ASN-LINIX NWIP Ltd | 6.1K | 524.3K | 9 |
| AS212581GB | BIDFX SGX FX SYSTEMS UK LIMITED | 5.9K | — | 14 |
| AS59455GB | CSG-AS Clearstream Technology ltd | 5.9K | 524.3K | 10 |
| AS30931GB | IGINDEX-PLC IG Index Ltd. | 5.9K | 524.3K | 19 |
| AS42353GB | SIMWOOD Simwood eSMS Limited | 5.9K | — | 14 |
| AS212109GB | SQUIRREL Squirrel Internet Ltd | 5.9K | 131.1K | 12 |
| AS34967GB | DRD-AS DRD Communications Limited | 5.9K | — | 13 |
| AS202013GB | MIL-POP Mobile Internet Limited | 5.9K | — | 20 |
| AS34790GB | AS34790 TFM NETWORKS LIMITED | 5.6K | — | 3 |
| AS16032GB | TIBUS-ULTRAFAST The Internet Business Ltd | 5.6K | — | 5 |
| AS31493GB | TWENTYTWENTYMEDIA-AS TWENTYTWENTYMEDIA LIMITED | 5.6K | 65.5K | 5 |
| AS44403GB | BRISTOL-CITY-COUNCIL Bristol City Council | 5.6K | — | 8 |
| AS59816GB | BLYNX 4on LTD | 5.6K | 524.3K | 10 |
| AS20652GB | UNITRON-AS Unitron Systems & Development LTD | 5.6K | — | 4 |
| AS16096GB | betfair The Sporting Exchange (Clients) Ltd | 5.6K | — | 22 |
| AS205826GB | CONTENTHOST-AS CONTENTHOST LIMITED | 5.6K | — | 5 |
| AS197039GB | NOMURA-NET1-AS1 Nomura International Plc | 5.6K | — | 22 |
| AS50023GB | Vodat VCG TECHNOLOGY SERVICES LIMITED | 5.6K | — | 6 |
| AS56990GB | SYSCOMM Syscomm Limited | 5.6K | 524.3K | 7 |
| AS34816GB | AEG Anschutz Sports Holdings Limited | 5.4K | 65.5K | 6 |
| AS213529GB | SCULK-AS Sculk Ltd. | 5.4K | 18 | 23 |
| AS199542GB | SONASSI Iomart Managed Services Limited | 5.4K | — | 21 |
| AS213603GB | hullfibre Hull Fibre Ltd | 5.4K | 524.3K | 4 |
| AS29664GB | RGCOM-VANCO-HAI Flag Telecom UK Limited | 5.4K | — | 5 |
| AS206934GB | BFC-UK Beeks Financial Cloud Ltd | 5.4K | — | 18 |
| AS13005GB | C2INTERNET Atlas Business Group of Companies Ltd | 5.4K | 65.5K | 13 |
| AS56696GB | ASLIQUID-MPLS Liquid Telecommunications Ltd | 5.4K | — | 21 |