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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.
3,134 autonomous systems registered to United Kingdom. Click an AS for detail.
| 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 |
| 1K |
| 2 |
| 6 |
| AS205599GB | abfoods A.B.F.HOLDINGS LIMITED | 1K | — | 1 |
| AS6779GB | ICLNET-AS Fujitsu Services Ltd. | 1K | — | 2 |
| AS213867GB | TENERITY-AS TENERITY LIMITED | 1K | — | 4 |
| AS61281GB | NDT-AS Chess Limited | 1K | — | 1 |
| AS12884GB | DRW-Investments-AS DRW Investments (UK) Limited | 1K | — | 4 |
| AS50203GB | UK-Reynolds-ASN Reynolds and Reynolds Limited | 1K | — | 3 |
| AS200052GB | FERAL Feral.io Ltd | 1K | — | 1 |
| AS51491GB | SYSGROUP-WALES SysGroup plc | 1K | — | 2 |
| AS201664GB | netwarm NetWarm LTD | 1K | — | 4 |
| AS197594GB | REDSTOR-AS Redstor Limited | 1K | — | 4 |
| AS207245GB | DSTI-ASN DSTI Holdings Limited | 1K | — | 1 |
| AS202114GB | Blue_Sky_Systems Blue Sky Systems Limited | 1K | 65.5K | 5 |
| AS207072GB | NIGSUN Nigsun Limited | 1K | 262.1K | 2 |
| AS44009GB | SLEEK-ASN Rackspace Ltd. | 1K | 65.5K | 2 |
| AS60593GB | NR-DC-UK-AS Network Rail Infrastructure Limited | 1K | — | 3 |
| AS203449GB | HOPEWISER-MERLIN Hopewiser Ltd | 1K | 65.5K | 2 |
| AS215453GB | NUFIBRE-AS Nufibre Ltd | 1K | 65.5K | 3 |
| AS8669GB | TOTALWEBSOLUTIONS Total Web Solutions Ltd | 1K | — | 4 |
| AS51318GB | STANDARD-CHARTERED-BANK-AS STANDARD CHARTERED BANK | 1K | — | 4 |
| AS51221GB | LMAX-HOSTING LMAX Limited | 1K | — | 1 |
| AS205918GB | vertivco-emea VERTIV COMPANY GROUP LIMITED | 1K | — | 1 |
| AS213790GB | LimitedNetwork-AS Limited Network LTD | 1K | — | 4 |
| AS209198GB | AS-ORECAT Offshore Renewable Energy Catapult | 1K | 65.5K | 2 |
| AS209899GB | NUBIS zananet Limited | 1K | — | 1 |
| AS206062GB | SpaceDataCentres Space Data Centres Ltd | 1K | — | 1 |
| AS16362GB | The-London-Metal-Exchange The London Metal Exchange | 1K | — | 3 |
| AS134536GB | ATT-NBE-GB - ATT NBE Equinix London | 1K | — | 4 |
| AS209199GB | Cloud-Unboxed-Limited Cloud Unboxed Limited | 1K | — | 4 |
| AS60011GB | MYTHIC-BEASTS-USA Mythic Beasts Ltd | 1K | 131.1K | 6 |
| AS43950GB | SPILSBY-AS Terence Froy trading as "Spilsby Internet Solutions" | 1K | 65.5K | 2 |
| AS41281GB | KEFF KeFF Networks Ltd | 1K | 2 | 6 |
| AS50468GB | CITRUS-AS CITRUS TELECOMMUNICATIONS LTD | 1K | — | 4 |
| AS203582GB | mts M-Tech Systems Ltd | 1K | — | 1 |
| AS207841GB | INFERNO Inferno Communications Ltd | 1K | 65.8K | 8 |
| AS202166GB | UKNETDOCS NetDocuments Limited | 1K | — | 4 |
| AS212217GB | bbonline BB-Online UK Ltd | 1K | 1 | 5 |
| AS201261GB | Watershed The Watershed Arts Trust Ltd | 1K | — | 1 |
| AS205197GB | kanta Kanta Enterprises Ltd | 1K | — | 1 |
| AS205739GB | Allness-NET Allness IT Ltd | 1K | 524.3K | 5 |
| AS202363GB | uk-rjobrien R.J. OBrien Limited | 1K | — | 1 |
| AS39520GB | SD-TECHOPS-NL Satcom Direct International Ltd. | 1K | — | 1 |
| AS216207GB | NEWCASTLE-COUNCIL-AS Newcastle City Council | 1K | — | 3 |
| AS50432GB | RBS-GBM-UKSTAFF Natwest Markets PLC | 1K | — | 3 |
| AS202264GB | DMESG-ICT-LTD DMESG ICT Ltd | 1K | — | 3 |
| AS201433GB | WSCL WISCOL LIMITED | 1K | — | 1 |
| AS213441GB | SLAYER-AS SLAYER GROUP LIMITED | 1K | — | 4 |