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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 | 170 |
| AS206067GB | H3GUK Hutchison 3G UK Limited | 1.1M | 332 |
| AS212238GB | CDNEXT Datacamp Limited | 976.9K | 4,012 |
| 12.8K |
| 65.5K |
| 5 |
| AS60672GB | SC ServerChoice Ltd | 12.8K | 196.6K | 26 |
| AS34931GB | AWARESOFT Awareness Software Limited | 12.8K | — | 9 |
| AS28690GB | ING-DIRECT-UK Barclays Bank PLC | 12.8K | — | 50 |
| AS57793GB | thirteenten 1310 Limited | 13.1K | 852K | 21 |
| AS33941GB | GCONNECT GConnect Technology Ltd | 13.1K | 65.5K | 8 |
| AS215730GB | H2NEXUS-AS H2NEXUS LTD | 13.1K | 196.6K | 37 |
| AS29527GB | ASTUTIUM-AS Astutium Limited | 13.3K | 1 | 12 |
| AS20799GB | DATANET-AS Datanet.co.uk Ltd | 13.8K | 524.3K | 5 |
| AS212174GB | jola Jola Cloud Solutions Ltd | 13.8K | — | 23 |
| AS49318GB | ARC-AS-UK TELEFONICA TECH UK MANAGED SERVICES LTD | 13.8K | — | 30 |
| AS34119GB | WILDCARD-AS Wildcard UK Limited | 14.1K | 589.8K | 17 |
| AS198736GB | StreamNetworks Stream Networks Ltd | 14.1K | 4.1K | 10 |
| AS31472GB | VOICEHOST VoiceHost Ltd | 14.1K | 524.3K | 15 |
| AS36454GB | WHG-DAL WHG Hosting Services Ltd | 14.1K | — | 51 |
| AS3213GB | BOGONS-ASN Bogons Ltd | 14.3K | 589.8K | 15 |
| AS5500GB | CHESS Chess ICT Ltd | 14.3K | 1.1M | 11 |
| AS32708GB | ROOT-NETWORKS LoadEdge Limited | 14.3K | 1 | 24 |
| AS49592GB | PIPE-NET Pipe Networks LTD | 14.3K | 18 | 34 |
| AS201106GB | SPARTANHOST Spartan Host Ltd | 14.6K | — | 54 |
| AS48266GB | Catixs Catixs Ltd | 14.6K | 340K | 84 |
| AS34282GB | UKNOC-AS Team Blue Carrier Limited | 14.6K | 65.5K | 5 |
| AS39522GB | CONVERGED Converged Communication Solutions Limited | 14.6K | 524.3K | 20 |
| AS47638GB | CADENCE-AS Cadence Networks Ltd | 14.8K | 2.1M | 26 |
| AS207569GB | I-SERVERS-NORTH-EU IHOR HOSTING LTD | 14.8K | 4 | 62 |
| AS58173GB | ONWAVE Onwave UK Ltd | 15.1K | — | 19 |
| AS204997GB | FIRSTBYTE-AS FIRST SERVER LIMITED | 15.1K | 15 | 74 |
| AS48294GB | CC-AS Spectrum Internet Ltd | 15.1K | — | 15 |
| AS43545GB | TELEDATA Teledata UK Limited | 15.4K | 65.5K | 20 |
| AS205090GB | FIRST-SERVER-EUROPE FIRST SERVER LIMITED | 15.4K | 65.5K | 62 |
| AS207645GB | FWNETWORKS-AS F & W Networks Ltd | 15.4K | 524.3K | 23 |
| AS33820GB | REED-ELSEVIER-AS RELX GROUP PLC | 15.4K | — | 15 |
| AS60969GB | GetOnline GetOnline Limited | 15.4K | — | 8 |
| AS29180GB | O2-ONLINE-AS Telefonica UK Limited | 15.4K | — | 22 |
| AS43599GB | NWEWN-AS Broadband N.I. Ltd. | 15.4K | — | 7 |
| AS8902GB | IFB CCS Connectivity Limited | 15.6K | 65.5K | 6 |
| AS41107GB | backbone-connect Backbone Connect Limited | 15.6K | 524.3K | 16 |
| AS51048GB | NEXT-CONNEX WIFINITY LIMITED | 15.6K | 524.3K | 10 |
| AS208189GB | UK-SWISH AllPoints Fibre Networks Limited | 15.9K | 131.1K | 11 |
| AS48589GB | TIGER Tiger Network Limited | 15.9K | — | 11 |
| AS64080GB | SYN-UK SYN LTD | 16.1K | 131.1K | 44 |
| AS213607GB | WORLD-FIRST-COMMUNICATION-LTD WORLD FIRST COMMUNICATION LTD | 16.1K | 4.1K | 58 |
| AS21369GB | SEMA-UK-AS Atos IT Services UK Ltd | 16.1K | — | 46 |
| AS199614GB | FICITY-AS-01 Fiberocity Ltd | 16.1K | 131.1K | 67 |
| AS16334GB | Sureline-Communications-UK Sureline Communications Limited | 16.4K | — | 2 |
| AS9011GB | The Patent Office | 16.4K | 65.5K | 10 |
| AS204222GB | HMRC-AS His Majesty's Revenue and Customs | 16.4K | — | 1 |