A list of all United Kingdom ASNs including hosting providers, ISPs, and businesses with announced IPv4 and IPv6 prefixes.
| ASN | Type | IPv4 Routes | IPv6 Routes | Company |
|---|---|---|---|---|
| AS212238 | Hosting Provider | 3,251 | 670 | Datacamp Limited |
| AS62240 | Hosting Provider | 1,355 | 1,242 | Clouvider Limited |
| AS2856 | ISP & Mobile | 479 | 7 | British Telecommunications PLC |
| AS60068 | Hosting Provider | 408 | 79 | Datacamp Limited |
| AS58065 | Hosting Provider | 377 | 7 | Orion Network Limited |
| AS42831 | Hosting Provider | 330 | 10 | UK Dedicated Servers Limited |
| AS21433 | Other Business | 326 | 102 | Accenture UK Limited |
| AS42689 | ISP & Mobile | 314 | 3 | Glide Student & Residential Limited |
| AS30844 | ISP & Mobile | 299 | 25 | Liquid Telecommunications Ltd |
| AS5089 | ISP & Mobile | 297 | 3 | Virgin Media Limited |
| AS214143 | Hosting Provider | 270 | 0 | SKYDIGITAL TELECOM LTD |
| AS206067 | ISP & Mobile | 257 | 75 | Hutchison 3G UK Limited |
| AS215540 | ISP & Mobile | 236 | 37 | GLOBAL CONNECTIVITY SOLUTIONS LLP |
| AS3223 | Hosting Provider | 234 | 27 | Voxility LLP |
| AS16247 | ISP & Mobile | 224 | 5 | Convergence Group (Wireless) Networks Limited |
| AS8851 | Other Business | 218 | 6 | GCI Network Solutions Limited |
| AS786 | Education | 212 | 7 | Jisc Services Limited |
| AS13213 | Hosting Provider | 209 | 22 | THG HOSTING LIMITED |
| AS20860 | Hosting Provider | 209 | 18 | IOMART CLOUD SERVICES LIMITED |
| AS25369 | Hosting Provider | 209 | 18 | Hydra Communications Ltd |
| AS41564 | Hosting Provider | 193 | 7 | Orion Network Limited |
| AS44444 | Other Business | 193 | 2 | Forcepoint UK Limited |
| AS214432 | Hosting Provider | 178 | 2 | Zhilian Technology CO., LTD. |
| AS61112 | Other Business | 153 | 32 | AKILE LTD |
| AS8220 | ISP & Mobile | 153 | 19 | COLT Technology Services Group Limited |
| AS15404 | ISP & Mobile | 151 | 10 | COLT Technology Services Group Limited |
| AS205489 | Other Business | 146 | 0 | CODE ASSET LTD |
| AS214238 | Hosting Provider | 143 | 0 | HOST TELECOM LTD |
| AS31727 | Hosting Provider | 142 | 2 | Node4 Limited |
| AS215439 | Other Business | 128 | 6 | PLAY2GO INTERNATIONAL LIMITED |
| AS3300 | ISP & Mobile | 122 | 29 | British Telecommunications PLC |
| AS8698 | Other Business | 109 | 0 | NATIONWIDE BUILDING SOCIETY |
| AS201838 | ISP & Mobile | 102 | 2 | Community Fibre Limited |
| AS5413 | ISP & Mobile | 101 | 5 | Wavenet Limited |
| AS35228 | ISP & Mobile | 100 | 20 | Telefonica UK Limited |
| AS203346 | Other Business | 100 | 0 | Proper Support LLP |
| AS207957 | Other Business | 96 | 18 | SERV.HOST GROUP LTD |
| AS215590 | Hosting Provider | 96 | 6 | DpkgSoft International Limited |
| AS56478 | ISP & Mobile | 95 | 3 | Hyperoptic Ltd |
| AS15914 | Other Business | 95 | 0 | British Airways plc |
| AS13285 | ISP & Mobile | 91 | 5 | TalkTalk Communications Limited |
| AS41095 | ISP & Mobile | 90 | 209 | IPTP LTD |
| AS207461 | Other Business | 90 | 8 | HOSTING INDUSTRY LIMITED |
| AS213877 | Other Business | 88 | 3 | U1 DIGITAL SERVICES LTD |
| AS49765 | ISP & Mobile | 83 | 0 | Comms365 Limited |
| AS8426 | Hosting Provider | 82 | 18 | Claranet Limited |
| AS5400 | ISP & Mobile | 78 | 33 | British Telecommunications PLC |
| AS216127 | Hosting Provider | 78 | 5 | INTERNATIONAL HOSTING COMPANY LIMITED |
| AS210546 | Other Business | 75 | 1 | CHSL ONE LTD |
| AS20738 | Hosting Provider | 74 | 3 | Heart Internet limited |
| AS15395 | Hosting Provider | 73 | 1 | Rackspace Ltd. |
| AS20712 | ISP & Mobile | 72 | 21 | Andrews & Arnold Ltd |
| AS3170 | Hosting Provider | 69 | 12 | VeloxServ Communications Ltd |
| AS8680 | ISP & Mobile | 69 | 3 | Sure (Guernsey) Limited |
| AS51561 | ISP & Mobile | 69 | 2 | ICUK Computing Services Limited |
| AS209641 | Hosting Provider | 68 | 18 | IHOR HOSTING LTD |
| AS49915 | Other Business | 67 | 38 | Megaport (UK) Limited |
| AS21267 | ISP & Mobile | 65 | 1 | Wavenet Limited |
| AS9002 | ISP & Mobile | 65 | 1 | RETN Limited |
| AS213887 | Other Business | 64 | 9 | WAIcore Ltd |
| AS29611 | Hosting Provider | 64 | 6 | Elite Limited |
| AS42973 | ISP & Mobile | 64 | 0 | Convergence Group (Wireless) Networks Limited |
| AS50131 | Hosting Provider | 63 | 35 | Spartan Host Ltd |
| AS199614 | ISP & Mobile | 63 | 4 | Fiberocity Ltd |
| AS60819 | Hosting Provider | 62 | 2 | Safenames Ltd. |
| AS6871 | ISP & Mobile | 61 | 3 | British Telecommunications PLC |
| AS216138 | ISP & Mobile | 60 | 32 | SKYQUANTUM TELECOM LTD. |
| AS205544 | Hosting Provider | 60 | 29 | Leaseweb UK Limited |
| AS204997 | Hosting Provider | 60 | 15 | FIRST SERVER LIMITED |
| AS48101 | Other Business | 60 | 13 | Trooli Ltd. |
| AS205090 | Hosting Provider | 60 | 2 | FIRST SERVER LIMITED |
| AS48266 | Hosting Provider | 59 | 28 | Catixs Ltd |
| AS61323 | Other Business | 59 | 6 | ANS ACADEMY LIMITED |
| AS12703 | Hosting Provider | 58 | 7 | Pulsant (Scotland) Ltd |
| AS207569 | Hosting Provider | 57 | 4 | IHOR HOSTING LTD |
| AS213607 | Other Business | 57 | 1 | WORLD FIRST COMMUNICATION LTD |
| AS29457 | Hosting Provider | 55 | 4 | Options Technology Ltd |
| AS25577 | Other Business | 54 | 1 | MAINFRAME & CYBERNETIC SYSTEMS LIMITED |
| AS31515 | ISP & Mobile | 54 | 1 | Inmarsat Global Limited |
| AS201106 | Hosting Provider | 54 | 0 | Spartan Host Ltd |
| AS5607 | ISP & Mobile | 51 | 30 | Sky UK Limited |
| AS36454 | Hosting Provider | 51 | 0 | WHG Hosting Services Ltd |
| AS43915 | ISP & Mobile | 50 | 1 | TrueSpeed Communications Limited |
| AS28690 | Other Business | 50 | 0 | Barclays Bank PLC |
| AS202596 | ISP & Mobile | 49 | 0 | GNC Realisations 2026 Limited |
| AS58273 | ISP & Mobile | 48 | 20 | Broadband for the Rural North Limited. |
| AS4455 | Other Business | 47 | 15 | IX Reach Ltd |
| AS8468 | ISP & Mobile | 47 | 3 | Cityfibre Limited |
| AS60187 | Education | 47 | 2 | London Grid for Learning Trust |
| AS8435 | Other Business | 47 | 0 | Lloyds Banking Group PLC |
| AS200740 | Hosting Provider | 46 | 14 | FIRST SERVER LIMITED |
| AS34010 | Other Business | 46 | 7 | Yahoo-UK Limited |
| AS206134 | Other Business | 46 | 5 | NEKOBYTE INTERNATIONAL LIMITED |
| AS25180 | ISP & Mobile | 46 | 3 | Exponential-E Ltd. |
| AS21369 | Other Business | 46 | 0 | Atos IT Services UK Ltd |
| AS25160 | Other Business | 45 | 1,077 | Vorboss Limited |
| AS209693 | Hosting Provider | 45 | 6 | OC NETWORKS LIMITED |
| AS201002 | Hosting Provider | 45 | 4 | PebbleHost Ltd |
| AS204339 | Hosting Provider | 44 | 2 | FIRST SERVER LIMITED |
| AS209181 | Hosting Provider | 43 | 8 | Zenex 5ive Limited |