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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 |
| 100.6K |
| 98.3K |
| 232 |
| AS12701GB | BARCAP Barclays Bank plc | 99.6K | — | 31 |
| AS5503GB | RMIFL RM Education Ltd | 99.3K | 65.5K | 41 |
| AS48101GB | TROOLI-AS Trooli Ltd. | 99.1K | 459K | 75 |
| AS214143GB | skydigital-telecom SKYDIGITAL TELECOM LTD | 98.3K | — | 276 |
| AS49758GB | LLOYDSBANKING Lloyds Banking Group PLC | 98.3K | — | 11 |
| AS58065GB | PacketExchange Orion Network Limited | 98K | 6 | 386 |
| AS25160GB | VORBOSS Vorboss Limited | 97K | 1.6M | 37 |
| AS42973GB | METRONETUK_M24SEVEN Convergence Group (Wireless) Networks Limited | 95.7K | — | 62 |
| AS21267GB | Wavenet-AS21267 Wavenet Limited | 89.9K | 65.5K | 65 |
| AS31515GB | AS-INMARSAT Inmarsat Global Limited | 87.6K | 65.5K | 55 |
| AS24867GB | Adapt-AS Rackspace Ltd. | 86.3K | — | 14 |
| AS29550GB | SIMPLYTRANSIT Team Blue Carrier Limited | 86K | 65.5K | 13 |
| AS61323GB | UKFAST ANS ACADEMY LIMITED | 82.7K | 589.8K | 66 |
| AS2818GB | BBC BBC | 81.9K | 196.6K | 7 |
| AS60187GB | LGFL-AS London Grid for Learning Trust | 81.7K | 786.4K | 49 |
| AS8680GB | SURE-International-Limited Sure (Guernsey) Limited | 81.4K | 655.4K | 72 |
| AS8435GB | LBG_INTERNET_EDGE Lloyds Banking Group PLC | 81.2K | — | 51 |
| AS16082GB | SPITFIRE Spitfire Network Services Limited | 79.9K | 65.5K | 13 |
| AS51561GB | AS-ICUK ICUK Computing Services Limited | 78.8K | 65.5K | 71 |
| AS31727GB | NODE4-AS Node4 Limited | 78.6K | 131.1K | 144 |
| AS3223GB | VOXILITY Voxility LLP | 74.2K | 282 | 264 |
| AS35575GB | VAIONI Vaioni Group Ltd | 73.2K | 131.1K | 38 |
| AS24775GB | AS24775 Qinetiq Limited | 69.6K | — | 2 |
| AS21296GB | ASN-PwC-UK Pricewaterhousecoopers Services Limited | 67.1K | — | 7 |
| AS30740GB | EXA-NETWORKS Exa Networks Limited | 67.1K | 524.3K | 5 |
| AS50292GB | STRATOGEN Access UK Ltd | 66.8K | — | 37 |
| AS39400GB | LBH-AS London Borough of Hackney | 65.8K | — | 2 |
| AS201773GB | UOW-AS University of Warwick | 65.8K | — | 2 |
| AS15601GB | Baring Investment Services Ltd | 65.5K | — | 1 |
| AS212655GB | youfibre YouFibre Limited | 65.3K | 524.5K | 40 |
| AS202596GB | GNETWORK GNC Realisations 2026 Limited | 64.3K | — | 49 |
| AS212465GB | COMCAST-UK-2 Comcast International Holdings UK Limited | 62.5K | 38 | 20 |
| AS215540GB | GCS-AS GLOBAL CONNECTIVITY SOLUTIONS LLP | 60.9K | 36 | 263 |
| AS29107GB | SYNAPSE-AS Synapse Network LTD | 58.9K | 2 | 25 |
| AS4455GB | BSO IX Reach Ltd | 58.4K | 221.7K | 43 |
| AS59395GB | EFAR-AS Southern Communications Ltd | 56.6K | 1.2M | 29 |
| AS5482GB | AS5482 AllPoints Fibre Limited | 56.3K | 632.8K | 31 |
| AS35425GB | BYTEMARK-AS Iomart Managed Services Limited | 55.8K | 720.9K | 26 |
| AS205544GB | LEASEWEB-UK-LON-11 Leaseweb UK Limited | 55.6K | 12.2M | 90 |
| AS25577GB | C4L-AS MAINFRAME & CYBERNETIC SYSTEMS LIMITED | 55.3K | 65.5K | 54 |
| AS15533GB | SASEUROPE Redcentric Solutions Ltd | 52.5K | 131.1K | 17 |
| AS5631GB | ELEVATE Telcom Networks Limited | 51.5K | 1.2M | 35 |
| AS41564GB | AS41564 Orion Network Limited | 51.2K | 7 | 201 |
| AS39356GB | Avanti-UK-AS Avanti Broadband Ltd | 50.9K | 77.8K | 10 |
| AS48945GB | IFNL-AS OPEN FIBRE NETWORKS (WHOLESALE) LIMITED | 50.2K | 524.3K | 40 |
| AS49158GB | WIFINITY WIFINITY NETWORKS LIMITED | 50.2K | 65.5K | 8 |