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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 | 368 |
| AS212238GB | CDNEXT Datacamp Limited | 1.1M | 4,290 |
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.
3,134 autonomous systems registered to United Kingdom. Click an AS for detail.
| AS | Holder | IPv4 ↓ | IPv6 /48 | Prefixes |
|---|---|---|---|---|
| AS59783GB | SBIX-DUS ONESAVINGS BANK PLC | 256 | — | 1 |
| AS212729GB | ERL Everlight Radiology Limited | 256 | — | 1 |
| AS24894GB | TAGWORLDWIDE Tag Europe Ltd | 256 | — | 1 |
| AS3252GB | FBRX-AS Fiberax Networking&Cloud Ltd | 256 | — | 1 |
| AS212781GB | Hypercon Hypercon Ltd | 256 | — | 1 |
| AS59660GB | DATAART-RDC DataArt Technologies UK Ltd | 256 | — | 1 |
| AS199131GB | CITY-OF-YORK-COUNCIL City of York Council | 256 | — | 1 |
| AS211142GB | as_gaussmanltd CARDOCK HOSTING LIMITED | 256 | — | 1 |
| AS29200GB | ESEYE Eseye Ltd | 256 | 524.3K | 2 |
| AS51005GB | FOURDINTERACTIVE 4D Interactive Ltd | 256 | — | 1 |
| AS47534GB | VocaLink-north-Ltd VOCALINK LTD | 256 | — | 1 |
| AS47219GB | NTT_GDC_Anycast NTT Global Data Centers EMEA UK Ltd. | 256 | 1 | 2 |
| AS34625GB | OSHS-AS OSHS Ltd | 256 | — | 1 |
| AS3220GB | INTERNET-TECHNOLOGY-ADVISORS Internet Technology Advisors Scandinavia Ab | 256 | — | 1 |
| AS34611GB | Mystere Matthew Southgate | 256 | — | 1 |
| AS50224GB | AS50224 MTRL GROUP LIMITED | 256 | — | 1 |
| AS205012GB | giant Giant Communications Ltd | 256 | 524.3K | 2 |
| AS210005GB | easysoft Easysoft Ltd | 256 | — | 1 |
| AS204208GB | Peravix Peravix Group LTD | 256 | 272 | 3 |
| AS57850GB | NWL-AS Northumbrian Water Ltd | 256 | — | 1 |
| AS41553GB | Reed-Managed-Services Reed Specialist Recruitment Limited | 256 | — | 1 |
| AS61283GB | MILLAR Andrew Millar Ltd | 256 | 1 | 2 |
| AS204293GB | TinyHomeLab TinyHomeLab Ltd | 256 | 1 | 2 |
| AS57377GB | LONDON-BOROUGH-OF-MERTON LONDON BOROUGH OF MERTON | 256 | — | 1 |
| AS212880GB | AS-LLTN-RIPE Rydal Communications Ltd | 256 | — | 1 |
| AS43131GB | KAY-NET Kay Net (UK) Ltd | 256 | 16 | 2 |
| AS207846GB | Lauren-Kelly Lauren Renee Kelly | 256 | 1 | 2 |
| AS211049GB | DHSC-ARP Department of Health and Social Care | 256 | — | 1 |
| AS214079GB | LENDNODES LendNodes LTD | 256 | — | 1 |
| AS34640GB | NEX-CORP-UK CME Operations Limited | 256 | — | 1 |
| AS15992GB | VISA-EUROPE Visa Europe Limited | 256 | — | 1 |
| AS209540GB | EXPEDIA-DUBLIN Expedia.com Ltd. | 256 | — | 1 |
| AS51303GB | Warsaw IQVIA SOLUTIONS HQ LTD | 256 | — | 1 |
| AS197213GB | NINETY-ONE-TELECOM 91TELECOM LTD | 256 | 17 | 3 |
| AS215636GB | NUSO-FRA NUSO CLOUD UK LIMITED | 256 | — | 1 |
| AS214214GB | Threadneedle_MNT Threadneedle Asset Management Holdings Ltd | 256 | — | 1 |
| AS208147GB | Snuggle Evie Snuggle | 256 | 1 | 2 |
| AS12628GB | SCREAMING-NET-AS JACO ENGELBRECHT | 256 | 1 | 2 |
| AS214294GB | NoobNet NOOB RP LTD | 256 | 2 | 3 |
| AS44268GB | JCB-AS J.C. BAMFORD EXCAVATORS LIMITED | 256 | — | 1 |
| AS219414GB | Taylor-Wimpey Taylor Wimpey PLC | 256 | — | 1 |
| AS198628GB | FIDESSA-AS FIDESSA TRADING UK LIMITED | 256 | — | 1 |
| AS211667GB | CO3 COMPANY 3 STUDIOS UK LTD | 256 | — | 1 |
| AS211188GB | ASBTSLTD Business Teleports and Solutions Limited | 256 | — | 1 |
| AS218713GB | NETCENSUS-AS NETCENSUS LTD | 256 | 1 | 2 |
| AS209870GB | Cylo Cylo Ltd | 256 | 524.3K | 2 |
| AS204318GB | BGPTOOLS-QA Benjamin Cartwright-Cox | 256 | 143 | 144 |
| AS204711GB | honest Honest Enterprises Ltd. | 256 | 65.5K | 2 |
| AS206530GB | VOXYONDER VOXYONDER NETWORK SERVICES UK LTD | 256 | — | 1 |
| AS210192GB | TOPLINESYSTEMS Topline Systems Ltd | 256 | — | 1 |