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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 | 168 |
| AS206067GB | H3GUK Hutchison 3G UK Limited | 1.1M | 340 |
| AS212238GB | CDNEXT Datacamp Limited | 1M | 4,120 |
| 30.5K |
| 65.5K |
| 20 |
| AS51809GB | BRSK BRSK Limited | 30K | 524.3K | 39 |
| AS34442GB | AMATISNETWORKS BNW TECHNOLOGY LTD | 28.9K | 65.5K | 12 |
| AS12519GB | FASTNETUK FastNet International Ltd | 28.7K | 65.5K | 5 |
| AS29611GB | ELITE-AS Elite Limited | 28.7K | 2.2M | 70 |
| AS42081GB | ecmwf-it European Centre for Medium-Range Weather Forecasts (ECMWF) | 28.4K | 2 | 9 |
| AS206347GB | RANSTON-AS-1 Wessex Internet Limited | 28.4K | — | 33 |
| AS41811GB | CONVERGENCE-GROUP CONVERGENCE (GROUP NETWORKS) LIMITED | 27.9K | 65.5K | 18 |
| AS202282GB | Fibrus FIBRUS NETWORKS LTD | 27.6K | 524.3K | 16 |
| AS42611GB | ZZOOMM Full Fibre Limited | 26.9K | 524.3K | 8 |
| AS207957GB | ServHost-AS SERV.HOST GROUP LTD | 26.6K | 1.1K | 122 |
| AS25098GB | NETCALIBRE Netcalibre Ltd | 26.1K | 65.5K | 14 |
| AS47264GB | LDEX Iomart Managed Services Limited | 26.1K | 196.6K | 37 |
| AS210874GB | box-broadband Box Broadband Limited | 25.6K | 524.3K | 5 |
| AS215590GB | XORA-AS DpkgSoft International Limited | 25.3K | 114 | 105 |
| AS56595GB | FLUENCY Commsworld Ltd | 25.1K | 65.5K | 41 |
| AS209341GB | WHG-FRA WHG Hosting Services Ltd | 25.1K | — | 33 |
| AS9153GB | BURSTFIRE-EU Burstfire Networks Ltd | 25.1K | 65.5K | 4 |
| AS30827GB | XTRAORDINARY-AS Extraordinary Managed Services Ltd | 24.8K | 98.3K | 14 |
| AS5552GB | DIALNET-UK Redcentric Solutions Ltd | 24.8K | 65.5K | 4 |
| AS39921GB | DE-RACKSPACE Rackspace Ltd. | 24.8K | 65.6K | 10 |
| AS16353GB | Merula Merula Limited | 23.8K | 1.2M | 22 |
| AS199468GB | Solway-Comms-UK GRAIN COMMUNICATIONS LIMITED | 23.8K | 1M | 7 |
| AS198440GB | Giganet AllPoints Fibre Networks Limited | 23.3K | 524.3K | 11 |
| AS212286GB | LONCONNECT LonConnect Ltd | 23K | 524.3K | 27 |
| AS30914GB | IOKO-AS Redcentric Solutions Ltd | 22.8K | — | 7 |
| AS200740GB | FIRST-SERVER-EU-AS FIRST SERVER LIMITED | 22.8K | 19 | 68 |
| AS15641GB | Arqiva Arqiva Communications Ltd | 22.8K | — | 16 |
| AS213877GB | U1DS-AS U1 DIGITAL SERVICES LTD | 22.5K | 4.2K | 91 |
| AS35826GB | NETSERVERS-AS Netservers Limited | 22.5K | 589.8K | 13 |
| AS210619GB | mth-networks Monkey Tree Hosting Limited | 22.3K | 131.1K | 15 |
| AS20705GB | HSBC-UK HSBC Bank plc | 21.5K | 6 | 33 |
| AS50957GB | MEMSET MEMSET Ltd | 21.5K | 65.5K | 9 |
| AS34555GB | CCS-Leeds-ASN C.C.S. (Leeds) Ltd | 21.5K | 65.5K | 18 |
| AS30967GB | TRUPHONE-LTD TP Global Operations Limited | 21.2K | — | 29 |
| AS31273GB | AS-BISTECH Bistech Managed Services Ltd | 21K | 65.5K | 10 |
| AS50131GB | SPARTANHOST Spartan Host Ltd | 21K | 24.6K | 104 |
| AS12496GB | IDNET Infinity Developments Limited | 21K | 65.5K | 8 |
| AS13205GB | British Telecommunications PLC | 21K | — | 16 |
| AS13126GB | SMS-NET Satellite Mediaport Services Ltd. | 20.5K | 524.3K | 18 |
| AS28757GB | ASN-SCOTNET Scotnet.co.uk Ltd | 20K | — | 11 |
| AS216127GB | NUXT-AS INTERNATIONAL HOSTING COMPANY LIMITED | 20K | 4.1K | 83 |
| AS60819GB | SAFENAMES-AS Safenames Ltd. | 20K | 65.5K | 64 |
| AS51551GB | CAPITA-AS Capita Business Services Ltd | 19.7K | — | 4 |
| AS216138GB | SKYQUANTUM-TELECOM SKYQUANTUM TELECOM LTD. | 19.7K | 1.8M | 100 |
| AS42228GB | Brightstar Brightstar Limited | 19.5K | 65.5K | 12 |
| AS3170GB | VELOXSERV VeloxServ Communications Ltd | 19.5K | 1.2M | 83 |