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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 |
| 256 |
| — |
| 1 |
| AS204767GB | PRIVATE-DATACENTER VIRTUAL PRIVATE SERVER DATACENTER LIMITED | 256 | — | 1 |
| AS202587GB | UMOJA-AS C2C Ltd | 256 | — | 1 |
| AS44697GB | C3-UK Computer & Communication Co. Limited | 256 | — | 1 |
| AS42875GB | NCP-AS National Car Parks Limited | 256 | — | 1 |
| AS57161GB | FTSOC Netcalibre Ltd | 256 | — | 1 |
| AS197106GB | TRPI-EU-AS T. Rowe Price International LTD | 256 | — | 1 |
| AS210988GB | LBHF London Borough Of Hammersmith & Fulham | 256 | — | 1 |
| AS210584GB | PwCITSCo PricewaterhouseCoopers IT Services Limited | 256 | — | 1 |
| AS44504GB | DEV-AS Andy Davidson | 256 | — | 1 |
| AS44355GB | COLOCATION Colocation Ltd | 256 | 257 | 3 |
| AS5464GB | NETD ZURICH DATACENTER LTD | 256 | — | 1 |
| AS204821GB | Sinofibre Sinofibre Limited | 256 | — | 1 |
| AS214064GB | Kevin-Titmarsh Kevin Titmarsh | 256 | 1 | 2 |
| AS213831GB | Toby Toby Dixon | 256 | — | 1 |
| AS216186GB | AS_PENTEST Pen Test Partners LLP | 256 | 65.5K | 2 |
| AS198075GB | BOUNCEZERO-MNT BounceZero Ltd | 256 | — | 1 |
| AS211067GB | LEC Eastbourne Borough Council | 256 | — | 1 |
| AS211339GB | VORTIA Vortia Ltd | 256 | — | 1 |
| AS60431GB | PNO-AS PNO Solutions Limited | 256 | 49 | 5 |
| AS35200GB | TransitX-Ltd TransitX Ltd | 256 | — | 1 |
| AS205936GB | ASCOULDIT COULD IT HOSTING LIMITED | 256 | — | 1 |
| AS201357GB | DPNET-FAST DPNET FAST RELIABLE HOSTING VPS CLOUD SOLUTIONS LTD | 256 | — | 1 |
| AS208393GB | DEDCLOUD Dedcloud Network Ltd | 256 | 2 | 3 |
| AS201303GB | CentralNic-Anycast-F CentralNic Ltd | 256 | 1 | 2 |
| AS203105GB | BlahajInternet Blahaj Internet Ltd | 256 | 1 | 2 |
| AS215023GB | LIME-HOST LIMEE NETWORK LTD | 256 | 1 | 2 |
| AS213692GB | CSCM CSCM Limited | 256 | 524.3K | 2 |
| AS201323GB | host-media-ltd Host Media Ltd | 256 | 65.5K | 2 |
| AS206146GB | PSND-UK PAYSEND TECHNOLOGY LIMITED | 256 | — | 1 |
| AS200425GB | BG-TAL Genius Sports UK Limited | 256 | 65.5K | 2 |
| AS200581GB | TFWFIBRE-ASN TfW Fibre Ltd | 256 | 524.3K | 2 |
| AS201115GB | PYLONONE Pylon One Ltd | 256 | 512 | 2 |
| AS197104GB | GENTOO-AS Gentoo Group Limited | 256 | — | 1 |
| AS213150GB | INDIGO-SYS Laurence White | 256 | 524.3K | 2 |
| AS59730GB | STEALTHBYTE StealthByte Network LTD | 256 | 1 | 2 |
| AS211803GB | AS_INTER_ACT CARDOCK HOSTING LIMITED | 256 | — | 1 |
| AS202190GB | ARISTO-NET-NA ARISTO NETWORKS LTD | 256 | 1 | 2 |
| AS41380GB | ALD-AS Ald Automotive Ltd | 256 | — | 1 |
| AS214295GB | SKYNET SKYNET NETWORK LTD | 256 | — | 1 |
| AS43079GB | Matchtech MATCHTECH GROUP (UK) LIMITED | 256 | — | 1 |
| AS209264GB | IVX Ivx Group Ltd | 256 | 1 | 2 |
| AS204220GB | STARLONDON-AS Star Europe Limited | 256 | — | 1 |
| AS34611GB | Mystere Matthew Southgate | 256 | — | 1 |
| AS210025GB | XXSL Alice Cat Research Ltd | 256 | 10 | 11 |
| AS211667GB | CO3 COMPANY 3 STUDIOS UK LTD | 256 | — | 1 |
| AS198892GB | MIXCLOUD-AS MIXCLOUD LTD | 256 | — | 1 |