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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 |
| 1K |
| 65.5K |
| 5 |
| AS51601GB | IPTP IPTP LTD | 1K | 4.1K | 3 |
| AS208402GB | cerner Cerner Limited | 1K | 128 | 2 |
| AS51491GB | SYSGROUP-WALES SysGroup plc | 1K | — | 2 |
| AS205372GB | evrocomuk Evrocom.uk Limited trading as Fiber Zone | 1K | — | 1 |
| AS213388GB | IIC-AS IIC RAIL LIMITED | 1K | — | 4 |
| AS206062GB | SpaceDataCentres Space Data Centres Ltd | 1K | — | 1 |
| AS12884GB | DRW-Investments-AS DRW Investments (UK) Limited | 1K | — | 4 |
| AS44824GB | CALLAGENIX-COLO-LONDON COMMI HOLDINGS LIMITED | 1K | — | 1 |
| AS61281GB | NDT-AS Chess Limited | 1K | — | 1 |
| AS62145GB | Bango BANGO.NET Ltd | 1K | — | 4 |
| AS203154GB | MITELIS-DOWNSTREAM MITELIS SECURITY LIMITED | 1K | — | 4 |
| AS59402GB | Virocom Virocom Limited | 1K | 524.3K | 2 |
| AS207511GB | LONDSTOCK-APAC London Stock Exchange PLC | 1K | — | 3 |
| AS209113GB | PRECEDENCE Precedence Technologies Ltd | 1K | — | 3 |
| AS204486GB | CHES-EAST Cheshire East Council | 1K | — | 1 |
| AS209899GB | NUBIS zananet Limited | 1K | — | 1 |
| AS206324GB | STELLIUM-DC Stellium Networks Limited | 1K | 524.3K | 2 |
| AS57110GB | AARAN-CLOUD-AS Aaran Perry | 1K | 533 | 9 |
| AS51221GB | LMAX-HOSTING LMAX Limited | 1K | — | 1 |
| AS205197GB | kanta Kanta Enterprises Ltd | 1K | — | 1 |
| AS204598GB | AS-VILLAGENETWORKS Village Networks Ltd. | 1K | 524.3K | 4 |
| AS50510GB | CRUK-AS Cancer Research UK | 1K | — | 4 |
| AS203171GB | CHITECHNOLOGY Chi Technology Ltd | 1K | — | 4 |
| AS50489GB | ORIEDGE Radiant Infrastructure 1 Limited | 1K | — | 4 |
| AS204939GB | TAC-COMMUNICATIONS-UK TAC COMMUNICATIONS LTD | 1K | 524.3K | 2 |
| AS6759GB | IOTX Pelion IoT Limited | 1K | — | 4 |
| AS60825GB | CITRIXSYSTEMS-AS-UK CLOUD SG UK LTD | 1K | — | 4 |
| AS62224GB | BullhornUK Bullhorn, International Limited | 1K | — | 4 |
| AS60060GB | AECOM-EMEA AECOM Limited | 1K | — | 1 |
| AS44009GB | SLEEK-ASN Rackspace Ltd. | 1K | 65.5K | 2 |
| AS208765GB | Bulletproof Bullet Proof VPN Ltd | 1K | 524.3K | 5 |
| AS198306GB | AESL1 AIG Europe (Services) Limited | 1K | — | 3 |
| AS20577GB | TRADEWEB TRADEWEB EUROPE LIMITED | 1K | — | 4 |
| AS49440GB | plustel PLUSTEL LIMITED | 1K | 65.5K | 2 |
| AS215925GB | VPSVAULTHOST VPSVAULT.HOST LTD | 1K | 16 | 5 |
| AS51545GB | ZSAH zsah Limited | 1K | — | 4 |
| AS56670GB | WSCC-AS West Sussex County Council | 1K | — | 2 |
| AS210087GB | ONTIX Ontix Sites No1 Limited | 1K | — | 1 |
| AS56637GB | Fixnetix Fixnetix Ltd | 1K | — | 3 |
| AS41281GB | KEFF KeFF Networks Ltd | 1K | 2 | 6 |
| AS208311GB | BOURNELEISURE Bourne Leisure Limited | 1K | — | 1 |
| AS34178GB | Qinetiq Qinetiq Limited | 1K | — | 4 |
| AS200124GB | FLEXUK-AS FLEXTRADE UK LIMITED | 1K | — | 4 |
| AS203573GB | tmcs Tailor Made Technologies Ltd | 1K | — | 1 |
| AS206686GB | NOMRES1 Nominet UK | 1K | — | 4 |
| AS59439GB | VOICEFACTORY-AS EvolveIP LTD | 1K | 0 | 2 |