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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.
| AS | Holder | IPv4 | Prefixes |
|---|---|---|---|
| AS5089GB | NTL Virgin Media Limited | 23M | 289 |
| AS2856GB | BT-UK-AS British Telecommunications Limited | 18.4M | 543 |
| AS13285GB | OPALTELECOM-AS TalkTalk Communications Limited | 7.7M | 99 |
| AS786GB | JANET - Jisc Services Limited | 7M | 219 |
| AS5607GB | BSKYB-BROADBAND-AS Sky UK Limited | 6.4M | 79 |
| AS5378GB | Vodafone Limited | 2.8M | 24 |
| AS6871GB | Plusnet British Telecommunications Limited | 2.1M | 64 |
| AS8220GB | COLT COLT Technology Services Group Limited | 1.5M | 173 |
| AS206067GB | H3GUK Hutchison 3G UK Limited | 1.1M | 369 |
| AS212238GB | CDNEXT Datacamp Limited | 1.1M | 4,286 |
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.
3,132 autonomous systems registered to United Kingdom. Click an AS for detail.
| AS | Holder | IPv4 ↓ | IPv6 /48 | Prefixes |
|---|---|---|---|---|
| AS41000GB | Freethought-AS Freethought Internet Limited | 8.7K | 1M | 12 |
| AS8676GB | PRTSYSTEMS PRT Systems Limited | 8.7K | 393.2K | 10 |
| AS28792GB | PUBLIC-INTERNET Public Internet Ltd | 8.4K | 131.1K | 14 |
| AS8838GB | STRIPE-21-GROUP-LIMITED Compuweb Communications Services Limited | 8.4K | 65.5K | 3 |
| AS15752GB | BP-US-1 BP International Ltd | 8.4K | — | 13 |
| AS29197GB | LEHMAN-AS3 Nomura International Plc | 8.4K | — | 23 |
| AS52148GB | ENIXLTD Enix Ltd | 8.4K | 524.3K | 13 |
| AS205489GB | CODEASSET CODE ASSET LTD | 8.4K | — | 26 |
| AS29636GB | CATALYST2-AS Team Blue Carrier Limited | 8.4K | 65.5K | 3 |
| AS202020GB | FLEXGRID Flexgrid Ltd | 8.4K | — | 9 |
| AS21077GB | ISP4BAS Specialist Computer Centres Plc | 8.4K | — | 12 |
| AS62313GB | PROACT-AS Proact IT UK Limited | 8.4K | — | 22 |
| AS16174GB | INTUITIV-AS Intuitiv Ltd. | 8.2K | 65.5K | 4 |
| AS24742GB | APAKGROUP-AS APAK Group Limited | 8.2K | — | 1 |
| AS41936GB | COLT-GROUP Colt International Ltd | 8.2K | — | 1 |
| AS9161GB | PSL Poundbury Systems Ltd. | 8.2K | — | 1 |
| AS44684GB | MYTHIC Mythic Beasts Ltd | 8.2K | 65.5K | 9 |
| AS35551GB | ASSIMISIS-AS TGL Services (UK) Ltd | 8.2K | 65.5K | 4 |
| AS42579GB | SARGASSO-EU-AS Comtec Enterprises Ltd | 8.2K | 98.3K | 8 |
| AS29446GB | CHUNKYCHIPS-AS ChunkyChips.net Limited | 8.2K | — | 1 |
| AS15510GB | CWCS-PS Compuweb Communications Services Limited | 8.2K | 65.5K | 13 |
| AS20695GB | C1UK-AS Capital One (Europe) Plc | 8.2K | — | 17 |
| AS29006GB | POBOX-AS Acora Limited | 8.2K | 4.1K | 3 |
| AS34270GB | INETC Internet Connections Ltd | 8.2K | 65.5K | 2 |
| AS39627GB | BSKYB Sky UK Limited | 8.2K | — | 1 |
| AS205892GB | NOMICAL Nomical Ltd | 8.2K | 524.3K | 14 |
| AS203090GB | BitsFlowCloud BITSFLOWCLOUD LTD | 7.9K | 6 | 27 |
| AS16260GB | GTT-AUS GTT - EMEA Ltd. | 7.9K | 4 | 11 |
| AS207043GB | DEDIK-IO DEDIK SERVICES LIMITED | 7.9K | 1 | 32 |
| AS205434GB | Elasticity BE SLOUGH DC UK LIMITED | 7.9K | — | 11 |
| AS60194GB | VTG-AS Anchor Computer Systems Ltd | 7.9K | — | 22 |
| AS62217GB | VooServers Vinters IT Ltd | 7.9K | 606.2K | 35 |
| AS21472GB | SERVERHOUSE ServerHouse Ltd | 7.9K | 65.5K | 12 |
| AS16032GB | TIBUS-ULTRAFAST The Internet Business Ltd | 7.7K | — | 7 |
| AS2589GB | WANSTOR Wanstor Ltd | 7.7K | 65.5K | 14 |
| AS212027GB | PebbleHost PebbleHost Ltd | 7.7K | 256 | 25 |
| AS41489GB | WF-AS Watchfront Limited | 7.7K | 65.5K | 6 |
| AS210892GB | LIGHTSPEED-UK-AS Lightspeed Networks Ltd | 7.7K | 1.5K | 28 |
| AS42332GB | TSC EKCO LONDON LIMITED | 7.7K | 131.1K | 9 |
| AS35071GB | UK-XOOM-SYSTEMS-AS Xoom Limited | 7.4K | — | 10 |
| AS25460GB | TNP-AS The Networking People (TNP) Limited | 7.4K | 65.5K | 10 |
| AS44369GB | EMBC-EMPSN-AS emPSN Services Limited | 7.4K | — | 5 |
| AS202051GB | NETGRID-HOST-LT NETGRID HOST LTD | 7.4K | — | 29 |
| AS205548GB | Zouter ZOUTER LIMITED | 7.4K | 6 | 35 |
| AS204167GB | hyve Hyve Ltd | 7.2K | 7 | 19 |
| AS29606GB | Borwood-AS Borwood Ltd | 7.2K | 65.5K | 11 |
| AS197898GB | IDSI Integrated Digital Services Ltd | 7.2K | 131.1K | 7 |
| AS204558GB | ODYSSEY Odyssey Systems Ltd | 7.2K | 65.5K | 5 |
| AS56396GB | Amobee NEXXEN GROUP LTD | 6.9K | 1 | 7 |
| AS201971GB | CreeperHostLTD-AS CreeperHost LTD | 6.9K | 193 | 27 |