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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 | 63 |
| AS8220GB | COLT COLT Technology Services Group Limited | 1.5M | 171 |
| AS206067GB | H3GUK Hutchison 3G UK Limited | 1.1M | 331 |
| AS8426GB | CLARANET-AS Claranet Limited | 909.3K | 100 |
| 256 |
| — |
| 1 |
| AS209015GB | TenTime-AS Ten Time Limited | 256 | — | 1 |
| AS200425GB | BG-TAL Genius Sports UK Limited | 256 | 65.5K | 2 |
| AS205615GB | SSC SS&C Solution Limited | 256 | — | 1 |
| AS50391GB | DIVERGENT DIVERGENT NETWORKS LTD | 256 | 65.6K | 5 |
| AS60758GB | DMC-AS Deluxe UK Holdings Limited | 256 | — | 1 |
| AS205936GB | ASCOULDIT COULD IT HOSTING LIMITED | 256 | — | 1 |
| AS41373GB | BT-Plc NATIONAL HEALTH SERVICE | 256 | — | 1 |
| AS202783GB | SWANN-MNT NHS National Services Scotland | 256 | — | 1 |
| AS202587GB | UMOJA-AS C2C Ltd | 256 | — | 1 |
| AS50108GB | EA-UK-BIR Electronic Arts Limited | 256 | — | 1 |
| AS33879GB | FORTHS-PORTS-PLC Forth Ports Public Limited Company | 256 | — | 1 |
| AS21464GB | EDF-AS EDF Trading Ltd | 256 | — | 1 |
| AS198222GB | WHC-AS West Herts College | 256 | — | 1 |
| AS48706GB | EDP KERRIDGE COMMERCIAL SYSTEMS (KSH) LIMITED | 256 | — | 1 |
| AS49209GB | CTE-ASN China Telecom Europe Ltd. | 256 | — | 1 |
| AS206773GB | MSXI MSX International Ltd | 256 | — | 1 |
| AS201304GB | CENTRALNIC-ANYCAST-E CentralNic Ltd | 256 | 1 | 2 |
| AS213016GB | holker-network-solutions Holker Network Solutions Ltd | 256 | — | 1 |
| AS28934GB | MIZUHO-AS Mizuho International Plc | 256 | — | 1 |
| AS198472GB | MANCHESTER-CC-AS Manchester City Council | 256 | — | 1 |
| AS201765GB | NECTMANIA-AS NECTMANIA NETWORK LIMITED | 256 | 512 | 3 |
| AS214079GB | LENDNODES LendNodes LTD | 256 | — | 1 |
| AS202590GB | HACKLAB Edinburgh Hacklab Ltd | 256 | 1 | 2 |
| AS203001GB | GateX GateX LIMITED | 256 | 1 | 2 |
| AS44782GB | UK-FOREX-AS Stratos Markets Limited | 256 | — | 1 |
| AS60698GB | LINXNETWORKS Linx-Networks-UK Ltd | 256 | — | 1 |
| AS48003GB | MORRISONS-AS Wm Morrison Supermarkets Limited | 256 | — | 1 |
| AS215023GB | LIME-HOST LIMEE NETWORK LTD | 256 | 1 | 2 |
| AS210584GB | PwCITSCo PricewaterhouseCoopers IT Services Limited | 256 | — | 1 |
| AS198243GB | GlobalEntry-AS GLOBAL ENTRY SOLUTIONS LTD | 256 | — | 1 |
| AS208723GB | VDX-SYSTEMS VDX SYSTEMS LTD | 256 | 4 | 5 |
| AS206457GB | EA-IE-GALWAY Electronic Arts Limited | 256 | — | 1 |
| AS210456GB | EastCostHosting EastCoastHost Ltd | 256 | 1 | 2 |
| AS204778GB | PaulLewis Paul Nicholas Lewis | 256 | 1 | 2 |
| AS21160GB | ASN-MARKEL Markel International Services Ltd | 256 | — | 1 |
| AS198231GB | SIXNET Sixnet Operation Ltd | 256 | — | 1 |
| AS204055GB | CentralNic-Anycast-H CentralNic Ltd | 256 | 1 | 2 |
| AS47935GB | QUANTUMUK-AS Quantum Communications Ltd | 256 | 65.5K | 2 |
| AS197284GB | K3X-MNT K3X SYSTEMS Ltd | 256 | 1 | 2 |
| AS200473GB | Samsung-MSK-AS Samsung SDS Europe Ltd | 256 | — | 1 |
| AS39461GB | BE-AS EDF ENERGY NUCLEAR GENERATION LIMITED | 256 | — | 1 |
| AS51692GB | HyberHost Steven Smith trading as HyberHost | 256 | 19 | 5 |
| AS198219GB | CHARLIE-AS Charlie Camilleri | 256 | 10 | 4 |
| AS5464GB | NETD ZURICH DATACENTER LTD | 256 | — | 1 |
| AS213493GB | NYRU NYRU Services Limited | 256 | — | 1 |
| AS34611GB | Mystere Matthew Southgate | 256 | — | 1 |