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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 |
| 2 |
| AS197958GB | Ogilvie-Communications NET DEFENCE LIMITED | 256 | — | 1 |
| AS56438GB | LOOPSCORPIO-AS Loop Scorpio Ltd | 256 | — | 1 |
| AS9014GB | CEFAS Centre for Environment Fisheries and Aquaculture Science (CEFAS) | 256 | — | 1 |
| AS197106GB | TRPI-EU-AS T. Rowe Price International LTD | 256 | — | 1 |
| AS48706GB | EDP KERRIDGE COMMERCIAL SYSTEMS (KSH) LIMITED | 256 | — | 1 |
| AS214079GB | LENDNODES LendNodes LTD | 256 | — | 1 |
| AS210005GB | easysoft Easysoft Ltd | 256 | — | 1 |
| AS210938GB | whitbread Whitbread Group PLC | 256 | — | 1 |
| AS200280GB | CameronSharp Cameron Sharp | 256 | 1 | 2 |
| AS201357GB | DPNET-FAST DPNET FAST RELIABLE HOSTING VPS CLOUD SOLUTIONS LTD | 256 | — | 1 |
| AS24894GB | TAGWORLDWIDE Tag Europe Ltd | 256 | — | 1 |
| AS59756GB | ENQUEST-AS Enquest Britain Limited | 256 | — | 1 |
| AS202288GB | MM Matthew Martin | 256 | 1 | 2 |
| AS202529GB | CDW-UK-IT-ASN CDW Ltd | 256 | — | 1 |
| AS213272GB | BFC-SY3 Beeks Financial Cloud Ltd | 256 | — | 1 |
| AS198353GB | MIMEO-AS Mimeo Limited | 256 | — | 1 |
| AS209750GB | MBX-AS MBX DIGITAL LIMITED | 256 | — | 1 |
| AS200468GB | ALVAREZ ALVAREZ & MARSAL DISPUTES AND INVESTIGATIONS LLP | 256 | — | 1 |
| AS51392GB | FUSIONED Fusioned Ltd | 256 | 65.5K | 2 |
| AS212031GB | BITSolutions-AS BIT Solutions Ltd | 256 | — | 1 |
| AS207273GB | PHAROAH-AS Pharoah Tools Limited | 256 | — | 1 |
| AS198375GB | DELUSION-NET Delusion Limited | 256 | 1 | 2 |
| AS205011GB | celertechuk Celer Technologies Limited | 256 | — | 1 |
| AS212404GB | Integral Integral UK Limited | 256 | — | 1 |
| AS12628GB | SCREAMING-NET-AS JACO ENGELBRECHT | 256 | 1 | 2 |
| AS49606GB | MCDEU01 MCD Europe Limited | 256 | — | 1 |
| AS211032GB | ASHALLSON LOBOS NETWORKING LTD | 256 | — | 1 |
| AS198981GB | NETSHIELD-BYOIP NETSHIELD LTD | 256 | 4.1K | 2 |
| AS212195GB | nexstor-as Nexstor Ltd | 256 | — | 1 |
| AS201304GB | CENTRALNIC-ANYCAST-E CentralNic Ltd | 256 | 1 | 2 |
| AS21160GB | ASN-MARKEL Markel International Services Ltd | 256 | — | 1 |
| AS48003GB | MORRISONS-AS Wm Morrison Supermarkets Limited | 256 | — | 1 |
| AS57477GB | monsternet Monsternet Highland Ltd | 256 | — | 1 |
| AS207536GB | SEABECKSOLUTIONS-AS SEABECK SOLUTIONS LIMITED | 256 | — | 1 |
| AS208902GB | ValeroUK Valero Energy Ltd | 256 | — | 1 |
| AS41373GB | BT-Plc NATIONAL HEALTH SERVICE | 256 | — | 1 |
| AS209997GB | securitas-uk-as-sms SECURITAS TECHNOLOGY LIMITED | 256 | — | 1 |
| AS204778GB | PaulLewis Paul Nicholas Lewis | 256 | 1 | 2 |
| AS204220GB | STARLONDON-AS Star Europe Limited | 256 | — | 1 |
| AS212880GB | AS-LLTN-RIPE Rydal Communications Ltd | 256 | — | 1 |
| AS198628GB | FIDESSA-AS FIDESSA TRADING UK LIMITED | 256 | — | 1 |
| AS43059GB | iitss IT Support Services Team Limited | 256 | 1 | 2 |
| AS214199GB | luxxysystems Johnathan Hine | 256 | 2 | 3 |
| AS212606GB | DiPocket DiPocket Limited | 256 | — | 1 |
| AS213546GB | AS_QUICK_BYTES Quick Bytes LTD | 256 | — | 1 |
| AS215003GB | TUBES_AS Internet Tubes LTD | 256 | — | 1 |