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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 |
| AS197576GB | zumbak ZUMBAK LTD | 256 | — | 1 |
| AS57377GB | LONDON-BOROUGH-OF-MERTON LONDON BOROUGH OF MERTON | 256 | — | 1 |
| AS44516GB | CTENET China Telecom Europe Ltd. | 256 | — | 1 |
| AS215303GB | Qubitbytes Qubitbytes LTD | 256 | — | 1 |
| AS205615GB | SSC SS&C Solution Limited | 256 | — | 1 |
| AS60698GB | LINXNETWORKS Linx-Networks-UK Ltd | 256 | — | 1 |
| AS214260GB | ITCommunications I.T Communications Limited | 256 | — | 1 |
| AS41548GB | MEDWAY-AS Medway Council | 256 | — | 1 |
| AS207846GB | Lauren-Kelly Lauren Renee Kelly | 256 | 1 | 2 |
| AS201694GB | RethinkTS Rethink Technology Solutions Ltd | 256 | — | 1 |
| AS197106GB | TRPI-EU-AS T. Rowe Price International LTD | 256 | — | 1 |
| AS204942GB | MifiNorx-AS MIFINORX LTD | 256 | — | 1 |
| AS216186GB | AS_PENTEST Pen Test Partners LLP | 256 | 65.5K | 2 |
| AS47578GB | PRT-ANYCAST PRT Systems Limited | 256 | — | 1 |
| AS202264GB | DMESG-ICT-LTD DMESG ICT Ltd | 256 | — | 1 |
| AS200709GB | Flotek-Shared-MNT Flotek Group Limited | 256 | — | 1 |
| AS51766GB | MFRS-AS Merseyside Fire and Rescue Service | 256 | — | 1 |
| AS213692GB | CSCM CSCM Limited | 256 | 524.3K | 2 |
| AS205772GB | LARMITGTOP-AS LARMITGTOP LTD | 256 | — | 1 |
| AS215551GB | Sweden_Internet_Exchange KeFF Networks Ltd | 256 | — | 1 |
| AS200280GB | CameronSharp Cameron Sharp | 256 | 1 | 2 |
| AS214770GB | RGN RGN Holding Ltd. | 256 | 34 | 5 |
| AS44426GB | SYNECTICS-AS Synectics Solutions Ltd | 256 | — | 1 |
| AS62112GB | XCONNECT-NL XConnect Services Limited | 256 | — | 1 |
| AS205237GB | SAVILLS-PLC SAVILLS PLC | 256 | — | 1 |
| AS50108GB | EA-UK-BIR Electronic Arts Limited | 256 | — | 1 |
| AS213272GB | BFC-SY3 Beeks Financial Cloud Ltd | 256 | — | 1 |
| AS203403GB | Flextel Flextel Limited | 256 | — | 1 |
| AS210812GB | CHRIS-PRITCHARD Christopher Pritchard | 256 | 257 | 3 |
| AS38936GB | HMUK-AS Herman Miller LTD | 256 | — | 1 |
| AS210025GB | XXSL Alice Cat Research Ltd | 256 | 10 | 11 |
| AS51047GB | TURTLE-NET Turtle Networks Ltd | 256 | — | 1 |
| AS206974GB | LALDY Laldy Ltd | 256 | — | 1 |
| AS56739GB | DICO PRT Systems Limited | 256 | — | 1 |
| AS213119GB | ALZ-SOFTWARE-AS ALZ Software Ltd | 256 | — | 1 |
| AS214064GB | Kevin-Titmarsh Kevin Titmarsh | 256 | 1 | 2 |
| AS211198GB | WHITESPIDER WhiteSpider Enterprise Services Limited | 256 | — | 1 |
| AS59756GB | ENQUEST-AS Enquest Britain Limited | 256 | — | 1 |
| AS56438GB | LOOPSCORPIO-AS Loop Scorpio Ltd | 256 | — | 1 |
| AS29048GB | EQUIDUCT Equiduct Systems Limited | 256 | — | 1 |
| AS211244GB | CANIDAE-SYSTEMS Harley Tomas Watson | 256 | 1 | 2 |
| AS47791GB | EA-FI-HELSINKI Electronic Arts Limited | 256 | — | 1 |
| AS48375GB | TIBRA-LC-AS Tibra Trading Europe Limited | 256 | — | 1 |
| AS208623GB | Threadneedle_MNT Threadneedle Asset Management Holdings Ltd | 256 | — | 1 |
| AS198472GB | MANCHESTER-CC-AS Manchester City Council | 256 | — | 1 |
| AS35241GB | vostel Vostel Limited | 256 | — | 1 |