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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 | 332 |
| AS212238GB | CDNEXT Datacamp Limited | 976.9K | 4,012 |
| 24.8K |
| 65.5K |
| 4 |
| AS30827GB | XTRAORDINARY-AS Extraordinary Managed Services Ltd | 24.8K | 98.3K | 14 |
| AS9153GB | BURSTFIRE-EU Burstfire Networks Ltd | 25.1K | 65.5K | 4 |
| AS56595GB | FLUENCY Commsworld Ltd | 25.3K | 65.5K | 41 |
| AS207957GB | ServHost-AS SERV.HOST GROUP LTD | 25.3K | 1.1K | 117 |
| AS210874GB | box-broadband Box Broadband Limited | 25.6K | 524.3K | 5 |
| AS47264GB | LDEX Iomart Managed Services Limited | 26.1K | 196.6K | 37 |
| AS25098GB | NETCALIBRE Netcalibre Ltd | 26.1K | 65.5K | 14 |
| AS42611GB | ZZOOMM Full Fibre Limited | 26.9K | 524.3K | 8 |
| AS202282GB | Fibrus FIBRUS NETWORKS LTD | 27.6K | 524.3K | 16 |
| AS41811GB | CONVERGENCE-GROUP CONVERGENCE (GROUP NETWORKS) LIMITED | 27.9K | 65.5K | 18 |
| AS42081GB | ecmwf-it European Centre for Medium-Range Weather Forecasts (ECMWF) | 28.4K | 2 | 9 |
| AS206347GB | RANSTON-AS-1 Wessex Internet Limited | 28.4K | — | 33 |
| AS12519GB | FASTNETUK FastNet International Ltd | 28.7K | 65.5K | 5 |
| AS29611GB | ELITE-AS Elite Limited | 28.7K | 2.2M | 70 |
| AS29009GB | UKBROADBAND-AS UK Broadband Ltd. | 28.7K | 65.5K | 4 |
| AS34442GB | AMATISNETWORKS BNW TECHNOLOGY LTD | 28.9K | 65.5K | 12 |
| AS51809GB | BRSK BRSK Limited | 30K | 524.3K | 39 |
| AS39537GB | HNS SysGroup plc | 30.5K | 69.6K | 26 |
| AS199335GB | TALKSTRAIGHT Talk Straight Ltd. | 30.5K | 65.5K | 23 |
| AS57099GB | QUICKLINE Quickline Communications Limited | 31.2K | — | 15 |
| AS39116GB | Telehouse Telehouse International Corporation of Europe Ltd | 31.2K | — | 14 |
| AS209641GB | I-SERVERS-EAST IHOR HOSTING LTD | 31.7K | 1.7M | 81 |
| AS31708GB | COREIX-UK-AS Coreix Ltd | 32K | 589.8K | 25 |
| AS49915GB | MEGAPORT Megaport (UK) Limited | 32K | 38 | 106 |
| AS58273GB | B4RN-AS Broadband for the Rural North Limited. | 32.5K | 688.1K | 68 |
| AS13009GB | VDATA Redcentric Solutions Ltd | 32.8K | 131.1K | 31 |
| AS39550GB | KPMG-UK-LLP-AS KPMG LLP | 32.8K | — | 4 |
| AS15570GB | INAP-LON PACKETFABRIC (UK) LTD | 33K | 16.4K | 17 |
| AS9115GB | INFB-AS9115 Hostpapa UK Ltd. | 33.5K | 65.6K | 6 |
| AS207995GB | LightningFibre LF Holdco 2 Limited | 33.8K | 262.1K | 4 |
| AS51704GB | SWGFL South West Grid for Learning Trust Ltd. | 33.8K | 65.5K | 3 |
| AS24916GB | ORBITAL-ASN Orbital Net Ltd | 34K | 65.5K | 26 |
| AS15412GB | FLAG-AS Flag Telecom UK Limited | 34.6K | 65.5K | 21 |
| AS215439GB | PLAY2GO-NET PLAY2GO INTERNATIONAL LIMITED | 35.3K | 51 | 137 |
| AS31463GB | FourD-AS Redcentric Solutions Ltd | 35.3K | 1.1M | 38 |
| AS29017GB | GYRON NTT Global Data Centers EMEA UK Ltd. | 35.6K | 65.5K | 11 |
| AS41678GB | TIBUS The Internet Business Ltd | 35.8K | — | 19 |
| AS51918GB | CERBERUSNETWORKS-AS Cerberus Networks Ltd | 36.1K | 589.8K | 26 |
| AS203346GB | AS-232WEB Proper Support LLP | 36.4K | — | 99 |
| AS44022GB | BARCLAYS-RETAIL Barclays Bank PLC | 36.4K | — | 20 |
| AS61231GB | Neos-Networks Neos Networks Limited | 36.4K | 524.3K | 7 |
| AS61112GB | AkileCloud AKILE LTD | 37.1K | 1.5K | 130 |
| AS49425GB | DIGITAL-REALTY-UK Digital Realty (UK) Limited | 37.4K | 524.3K | 10 |
| AS39545GB | FLUIDATA Fluidone Ltd. | 37.6K | 65.5K | 7 |
| AS6660GB | CWASIA VODAFONE ENTERPRISE EQUIPMENT LIMITED | 37.9K | 65.5K | 8 |
| AS205489GB | CODEASSET CODE ASSET LTD | 38.4K | — | 146 |