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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 | 170 |
| AS206067GB | H3GUK Hutchison 3G UK Limited | 1.1M | 336 |
| AS212238GB | CDNEXT Datacamp Limited | 983K | 4,036 |
| 40.4K |
| 65.5K |
| 26 |
| AS57356GB | HIGHNET-AS Highland Network Ltd | 41K | — | 33 |
| AS33920GB | AQL (aq) networks limited | 41K | 65.5K | 9 |
| AS34920GB | Simply-Romford Team Blue Carrier Limited | 41K | 65.5K | 14 |
| AS8622GB | ISIONUK TEAM BLUE INTERNET SERVICES UK LIMITED | 41.2K | 65.5K | 6 |
| AS41012GB | THECLOUD The Cloud Networks Limited | 42.2K | — | 10 |
| AS207461GB | host-industry HOSTING INDUSTRY LIMITED | 43K | 8 | 98 |
| AS49572GB | FCN Fujitsu Services Ltd. | 43K | 65.5K | 8 |
| AS9002GB | RETN-AS RETN Limited | 43.3K | 65.5K | 66 |
| AS24958GB | TBSH CYBERFORT LIMITED | 44.5K | 65.5K | 24 |
| AS43915GB | TRUESPEED TrueSpeed Communications Limited | 44.8K | 65.5K | 51 |
| AS49765GB | Comms365 Comms365 Limited | 45.8K | — | 83 |
| AS49158GB | WIFINITY WIFINITY NETWORKS LIMITED | 46.1K | 65.5K | 7 |
| AS31404GB | Lycatel-AS LYCATEL DISTRIBUTION UK LIMITED | 47.4K | 18 | 31 |
| AS5555GB | SOHONETEU-AS Sohonet Limited | 47.4K | 65.5K | 32 |
| AS20738GB | GD-EMEA-DC-LD5 Heart Internet limited | 47.6K | 3 | 77 |
| AS51043GB | ASPIRE01 Aspire Technology Solutions Ltd | 47.6K | 65.5K | 22 |
| AS8419GB | HOTCHILLI Redcentric Solutions Ltd | 49.2K | 65.5K | 6 |
| AS44444GB | Forcepoint-Cloud-AS Forcepoint UK Limited | 49.4K | 131.1K | 195 |
| AS41095GB | IPTP IPTP LTD | 49.4K | 13.9M | 300 |
| AS5631GB | ELEVATE Telcom Networks Limited | 50.2K | 655.4K | 32 |
| AS48945GB | IFNL-AS OPEN FIBRE NETWORKS (WHOLESALE) LIMITED | 50.2K | 524.3K | 40 |
| AS39356GB | Avanti-UK-AS Avanti Broadband Ltd | 50.9K | 77.8K | 10 |
| AS41564GB | AS41564 Orion Network Limited | 50.9K | 7 | 200 |
| AS15533GB | SASEUROPE Redcentric Solutions Ltd | 52.5K | 131.1K | 17 |
| AS205544GB | LEASEWEB-UK-LON-11 Leaseweb UK Limited | 55.3K | 12.2M | 89 |
| AS25577GB | C4L-AS MAINFRAME & CYBERNETIC SYSTEMS LIMITED | 55.6K | 65.5K | 55 |
| AS35425GB | BYTEMARK-AS Iomart Managed Services Limited | 55.8K | 720.9K | 26 |
| AS5482GB | AS5482 AllPoints Fibre Limited | 56.3K | 632.8K | 31 |
| AS59395GB | EFAR-AS Southern Communications Ltd | 56.6K | 1.1M | 28 |
| AS4455GB | BSO IX Reach Ltd | 57.9K | 221.7K | 44 |
| AS29107GB | SYNAPSE-AS Synapse Network LTD | 58.9K | 2 | 25 |
| AS212465GB | COMCAST-UK-2 Comcast International Holdings UK Limited | 62.5K | 38 | 20 |
| AS215540GB | GCS-AS GLOBAL CONNECTIVITY SOLUTIONS LLP | 63.2K | 37 | 270 |
| AS202596GB | GNETWORK GNC Realisations 2026 Limited | 64.3K | — | 49 |
| AS212655GB | youfibre YouFibre Limited | 65.3K | 524.5K | 40 |
| AS15601GB | Baring Investment Services Ltd | 65.5K | — | 1 |
| AS39400GB | LBH-AS London Borough of Hackney | 65.8K | — | 2 |
| AS201773GB | UOW-AS University of Warwick | 65.8K | — | 2 |
| AS214432GB | ZLIDC Zhilian Technology CO., LTD. | 66.3K | 2 | 253 |
| AS50292GB | STRATOGEN Access UK Ltd | 66.8K | — | 37 |
| AS21296GB | ASN-PwC-UK Pricewaterhousecoopers Services Limited | 67.1K | — | 7 |
| AS30740GB | EXA-NETWORKS Exa Networks Limited | 67.1K | 524.3K | 5 |
| AS24775GB | AS24775 Qinetiq Limited | 69.6K | — | 2 |
| AS35575GB | VAIONI Vaioni Group Ltd | 73.2K | 131.1K | 38 |
| AS3223GB | VOXILITY Voxility LLP | 73.5K | 280 | 259 |
| AS8435GB | LBG_INTERNET_EDGE Lloyds Banking Group PLC | 77.1K | — | 47 |