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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 | 332 |
| AS8426GB | CLARANET-AS Claranet Limited | 909.3K | 100 |
| 512 |
| — |
| 2 |
| AS35559GB | SOMEADDRESS Someaddress Networks Ltd | 512 | 2 | 2 |
| AS210253GB | CREATIVE-NETWORK-CONSULTING-AS Creative Network Consulting Limited | 512 | — | 2 |
| AS49401GB | BinkNet Bink Group Ltd | 512 | — | 1 |
| AS59410GB | BARRITEC Barritel Ltd | 512 | 65.5K | 3 |
| AS205359GB | precisely-ltd Precisely Software Ltd | 512 | — | 2 |
| AS41751GB | OCADO OCADO RETAIL LIMITED | 512 | — | 1 |
| AS61093GB | SC Solution Computers Ltd | 512 | — | 2 |
| AS204204GB | uk_point72uklimited Point72 UK Limited | 512 | — | 2 |
| AS34625GB | OSHS-AS OSHS Ltd | 512 | — | 2 |
| AS210450GB | ASN_NHSBARTSHEALTH BARTS HEALTH NHS TRUST | 512 | — | 2 |
| AS214557GB | hostmenow HOSTMENOW LTD | 512 | — | 2 |
| AS6540GB | SAMUEL-COSGROVE Samuel Cosgrove | 512 | — | 2 |
| AS41839GB | ConcentrixEuropeLtd Concentrix Europe Limited | 512 | — | 2 |
| AS212797GB | UK-PERFORMCONTENT Perform Content Services Limited | 512 | — | 1 |
| AS214098GB | hrzn-hosting Horizon Hosting Limited | 512 | 3 | 5 |
| AS211189GB | ThermoFisher_EU Thermo Electron Ltd | 512 | — | 1 |
| AS216361GB | NiN Next Internet Network Ltd | 512 | — | 2 |
| AS207108GB | ahcloud AH CLOUD LTD | 512 | 6 | 8 |
| AS204844GB | NCSE-NETWORK-Global NCSE NETWORK LTD | 512 | 4.4K | 16 |
| AS214294GB | NoobNet NOOB RP LTD | 512 | 2 | 4 |
| AS60654GB | METD-AS Metdesk Ltd | 512 | — | 2 |
| AS401568GB | MEMILUS - MEMILUS CREATIVE LLC | 512 | — | 2 |
| AS201497GB | express-as STAT EXPRESS SERVICES LTD | 512 | — | 1 |
| AS206246GB | Formosa FORMOSA CAPITAL LP | 512 | — | 2 |
| AS31659GB | Below-Zero Below Zero Hosting Ltd. | 512 | — | 2 |
| AS201528GB | ORCHID-CELLMARK-CHORLEY Orchid Cellmark Ltd | 512 | 1 | 3 |
| AS35106GB | MICROSOFT-LIVE-MEETING Microsoft Limited | 512 | 1 | 2 |
| AS49958GB | EVO-AS Evolution Gaming LTD | 512 | — | 2 |
| AS50656GB | Optix-Software-ASN Optix Software Ltd | 512 | — | 2 |
| AS5586GB | MCI-INT Verizon UK Limited | 512 | 32 | 3 |
| AS198032GB | UCLES-AS Cambridge Assessment | 512 | — | 2 |
| AS204624GB | sycurio Sycurio Limited | 512 | — | 2 |
| AS216274GB | uk-gigaloch Gigaloch Limited | 512 | 262.1K | 3 |
| AS206143GB | asn-networked2 Networked Creativity LLP | 512 | — | 2 |
| AS200008GB | PIRUM-AS Pirum Systems Limited | 512 | 524.3K | 3 |
| AS199204GB | WebMate Webmate Internet Services Ltd. | 512 | — | 1 |
| AS208026GB | LITTLEWOODS LITTLEWOODS LTD | 512 | — | 2 |
| AS206332GB | ARROW Arrow Business Communications Limited | 512 | 65.5K | 3 |
| AS51222GB | CMC-MARKETS-PLC CMC MARKETS PLC | 512 | — | 2 |
| AS208176GB | HYVE-MANAGED-HOSTING Hyve Ltd | 512 | 4 | 4 |
| AS50972GB | JamieOliver Jamie Oliver Ltd. | 512 | — | 1 |
| AS30769GB | BERKELEY-AS The Berkeley Group plc | 512 | — | 1 |
| AS214453GB | jandutech Beon Core Ltd | 512 | — | 2 |
| AS42214GB | GDNS Network Services Ltd. | 512 | 2 | 4 |
| AS212152GB | AS-Beazley Beazley Management Limited | 512 | — | 2 |
| AS212329GB | NETCRAFT Netcraft Ltd | 512 | 2 | 4 |