ASNs in the United Kingdom
Autonomous systems registered in the United Kingdom (GB)
Registered ASNs
3,132
Announcing routes
2,257
875 without routes
IPv4 addresses announced
68.6M
68,564,480 in total
Autonomous systems in the United Kingdom
Ranks 1–200 of 3,132. Ordered by announced IPv4 address space, then IPv6 prefixes; AS numbers that announce no routes follow in numerical order. IPv4 addresses are those of the AS's own prefixes, overlaps counted once.
| # | AS | Name | IPv4 prefixes | IPv4 addresses | IPv6 prefixes |
|---|---|---|---|---|---|
| 1 | AS2856 | BT-UK-AS British Telecommunications Limited | 542 | 13.9M | 7 |
| 2 | AS5089 | NTL Virgin Media Limited | 285 | 8.5M | 3 |
| 3 | AS786 | JANET Jisc Services Limited | 210 | 6.9M | 7 |
| 4 | AS5607 | BSKYB-BROADBAND-AS Sky UK Limited | 49 | 6.1M | 30 |
| 5 | AS13285 | OPALTELECOM-AS TalkTalk Communications Limited | 94 | 4M | 5 |
| 6 | AS5378 | Vodafone Limited | 23 | 2.5M | 1 |
| 7 | AS6871 | Plusnet British Telecommunications Limited | 61 | 2.1M | 2 |
| 8 | AS8220 | COLT COLT Technology Services Group Limited | 153 | 1.5M | 19 |
| 9 | AS212238 | CDNEXT Datacamp Limited | 3,594 | 1.1M | 737 |
| 10 | AS8426 | CLARANET-AS Claranet Limited | 87 | 904,704 | 18 |
| 11 | AS5413 | Wavenet-AS5413 Wavenet Limited | 103 | 734,720 | 5 |
| 12 | AS5400 | BT British Telecommunications Limited | 85 | 714,240 | 40 |
| 13 | AS8851 | EDGE GCI Network Solutions Limited | 344 | 620,544 | 6 |
| 14 | AS31655 | ASN-GammaTelecom Gamma Telecom Holdings Ltd | 36 | 609,536 | 3 |
| 15 | AS206067 | H3GUK Hutchison 3G UK Limited | 309 | 529,408 | 93 |
| 16 | AS13037 | ZEN-AS Zen Internet Ltd | 37 | 527,616 | 1 |
| 17 | AS3300 | BT British Telecommunications Limited | 123 | 513,280 | 29 |
| 18 | AS42689 | Glide Glide Student & Residential Limited | 357 | 497,920 | 3 |
| 19 | AS15395 | RACKSPACE-LON Rackspace Ltd. | 35 | 403,456 | 1 |
| 20 | AS20860 | IOMART-AS IOMART CLOUD SERVICES LIMITED | 192 | 388,864 | 16 |
| 21 | AS30844 | LIQUID-AS Liquid Telecommunications Ltd | 290 | 370,688 | 15 |
| 22 | AS8468 | ENTANET Cityfibre Limited | 46 | 358,912 | 3 |
| 23 | AS62240 | Clouvider Clouvider Limited | 1,304 | 344,320 | 1,118 |
| 24 | AS25180 | EXPONENTIAL-E-AS Exponential-E Ltd. | 44 | 291,328 | 3 |
| 25 | AS12390 | KINGSTON-UK-AS KCOM Group Limited | 17 | 259,072 | 2 |
| 26 | AS25310 | ASN-CWACCESS Vodafone Limited | 4 | 229,376 | 0 |
| 27 | AS201838 | ASN-COMMUNITYFIBRE Community Fibre Limited | 101 | 221,952 | 2 |
| 28 | AS35228 | O2BROADBAND Telefonica UK Limited | 114 | 215,296 | 26 |
| 29 | AS8607 | TIMICO Digital Space Group Limited | 20 | 205,568 | 4 |
| 30 | AS12703 | PULSANT-AS Pulsant (Scotland) Ltd | 60 | 180,224 | 7 |
| 31 | AS20712 | AS20712 Andrews & Arnold Ltd | 87 | 153,344 | 21 |
| 32 | AS47474 | Virtual1 Virtual1 Limited | 16 | 153,344 | 1 |
| 33 | AS15404 | COLT Technology Services Group Limited | 148 | 143,360 | 9 |
| 34 | AS56478 | BCUBE-AS Hyperoptic Ltd | 109 | 141,312 | 3 |
| 35 | AS198864 | QMW-AC-UK Queen Mary University of London | 5 | 132,864 | 2 |
| 36 | AS25369 | BANDWIDTH-AS Hydra Communications Ltd | 259 | 131,328 | 18 |
| 37 | AS8698 | NATIONWIDE BUILDING SOCIETY | 109 | 131,072 | 0 |
| 38 | AS15914 | British Airways plc | 34 | 131,072 | 0 |
| 39 | AS60068 | CDN77 Datacamp Limited | 422 | 130,048 | 79 |
| 40 | AS5587 | ITILITY-LIMITED Itility Limited | 13 | 121,856 | 1 |
| 41 | AS41354 | its-tg ITS Technology Group Limited | 42 | 117,248 | 3 |
| 42 | AS42831 | UKSERVERS-AS UK Dedicated Servers Limited | 268 | 112,128 | 8 |
| 43 | AS8586 | OBSL-AS TalkTalk Communications Limited | 16 | 108,032 | 1 |
| 44 | AS214143 | skydigital-telecom SKYDIGITAL TELECOM LTD | 283 | 107,264 | 0 |
| 45 | AS56329 | GIGACLEAR Gigaclear Limited | 31 | 106,496 | 3 |
| 46 | AS3223 | VOXILITY Voxility LLP | 381 | 105,216 | 30 |
| 47 | AS58065 | PacketExchange Orion Network Limited | 413 | 105,216 | 7 |
| 48 | AS6908 | DATAHOP Six Degrees Technology Group Limited | 43 | 104,448 | 5 |
| 49 | AS39326 | HSO-GROUP Syntura Group Limited | 30 | 104,192 | 5 |
| 50 | AS5503 | RMIFL RM Education Ltd | 40 | 99,328 | 1 |
| 51 | AS48101 | TROOLI-AS Trooli Ltd. | 62 | 99,072 | 13 |
| 52 | AS13213 | UK2NET-AS THG HOSTING LIMITED | 112 | 99,072 | 5 |
| 53 | AS44574 | A4N Network Services Ltd. | 18 | 98,048 | 9 |
| 54 | AS25160 | VORBOSS Vorboss Limited | 33 | 97,024 | 4 |
| 55 | AS42973 | METRONETUK_M24SEVEN Convergence Group (Wireless) Networks Limited | 63 | 94,976 | 0 |
| 56 | AS41230 | ASK4 ASK4 Limited | 16 | 88,320 | 7 |
| 57 | AS21267 | Wavenet-AS21267 Wavenet Limited | 63 | 87,552 | 1 |
| 58 | AS29550 | SIMPLYTRANSIT Team Blue Carrier Limited | 12 | 86,016 | 2 |
| 59 | AS24867 | Adapt-AS Rackspace Ltd. | 14 | 86,016 | 0 |
| 60 | AS214238 | iwihost HOST TELECOM LTD | 329 | 84,224 | 0 |
| 61 | AS49758 | LLOYDSBANKING Lloyds Banking Group PLC | 11 | 81,920 | 0 |
| 62 | AS61323 | UKFAST ANS ACADEMY LIMITED | 60 | 80,896 | 6 |
| 63 | AS16247 | M247-UK Convergence Group (Wireless) Networks Limited | 226 | 79,872 | 9 |
| 64 | AS16082 | SPITFIRE Spitfire Network Services Limited | 12 | 79,872 | 1 |
| 65 | AS2818 | BBC BBC | 4 | 73,728 | 3 |
| 66 | AS51561 | AS-ICUK ICUK Computing Services Limited | 72 | 73,216 | 2 |
| 67 | AS60187 | LGFL-AS London Grid for Learning Trust | 47 | 71,424 | 2 |
| 68 | AS21433 | AccentureFSSC Accenture UK Limited | 324 | 69,888 | 63 |
| 69 | AS24775 | AS24775 Qinetiq Limited | 2 | 69,632 | 0 |
| 70 | AS12701 | BARCAP Barclays Bank plc | 33 | 68,608 | 0 |
| 71 | AS30740 | EXA-NETWORKS Exa Networks Limited | 4 | 66,560 | 1 |
| 72 | AS8651 | MUSI MUFG Securities EMEA PLC | 10 | 65,792 | 0 |
| 73 | AS201773 | UOW-AS University of Warwick | 2 | 65,792 | 0 |
| 74 | AS31515 | AS-INMARSAT Inmarsat Global Limited | 54 | 65,536 | 1 |
| 75 | AS21054 | UK-NATWEST-AS21054 Natwest Markets PLC | 11 | 65,536 | 0 |
| 76 | AS21296 | ASN-PwC-UK Pricewaterhousecoopers Services Limited | 3 | 65,536 | 0 |
| 77 | AS21301 | UK-NATWEST-AS21301 Natwest Markets PLC | 15 | 65,536 | 0 |
| 78 | AS39400 | LBH-AS London Borough of Hackney | 2 | 65,536 | 0 |
| 79 | AS209237 | NPL-MANG-LTD NPL Management LTD | 2 | 65,536 | 0 |
| 80 | AS4455 | BSO IX Reach Ltd | 46 | 64,256 | 15 |
| 81 | AS202596 | GNETWORK GNC Realisations 2026 Limited | 49 | 64,256 | 0 |
| 82 | AS215540 | GCS-AS GLOBAL CONNECTIVITY SOLUTIONS LLP | 237 | 63,488 | 37 |
| 83 | AS31727 | NODE4-AS Node4 Limited | 143 | 60,672 | 2 |
| 84 | AS59395 | EFAR-AS Southern Communications Ltd | 27 | 56,832 | 4 |
| 85 | AS35425 | BYTEMARK-AS Iomart Managed Services Limited | 22 | 55,808 | 4 |
| 86 | AS29107 | SYNAPSE-AS Synapse Network LTD | 23 | 54,272 | 2 |
| 87 | AS15533 | SASEUROPE Redcentric Solutions Ltd | 15 | 52,224 | 2 |
| 88 | AS39356 | Avanti-UK-AS Avanti Broadband Ltd | 6 | 50,944 | 4 |
| 89 | AS44444 | Forcepoint-Cloud-AS Forcepoint UK Limited | 198 | 50,688 | 2 |
| 90 | AS25577 | C4L-AS MAINFRAME & CYBERNETIC SYSTEMS LIMITED | 53 | 50,688 | 1 |
| 91 | AS48945 | IFNL-AS OPEN FIBRE NETWORKS (WHOLESALE) LIMITED | 38 | 50,176 | 2 |
| 92 | AS8419 | HOTCHILLI Redcentric Solutions Ltd | 5 | 49,152 | 1 |
| 93 | AS41564 | AS41564 Orion Network Limited | 181 | 47,616 | 7 |
| 94 | AS5631 | ELEVATE Telcom Networks Limited | 30 | 47,616 | 4 |
| 95 | AS51043 | ASPIRE01 Aspire Technology Solutions Ltd | 21 | 47,616 | 1 |
| 96 | AS205544 | LEASEWEB-UK-LON-11 Leaseweb UK Limited | 66 | 47,104 | 31 |
| 97 | AS31404 | Lycatel-AS LYCATEL DISTRIBUTION UK LIMITED | 28 | 47,104 | 3 |
| 98 | AS43915 | TRUESPEED TrueSpeed Communications Limited | 50 | 44,800 | 1 |
| 99 | AS35575 | VAIONI Vaioni Group Ltd | 35 | 44,288 | 2 |
| 100 | AS41095 | IPTP IPTP LTD | 88 | 44,032 | 228 |
| 101 | AS5482 | AS5482 AllPoints Fibre Limited | 15 | 44,032 | 16 |
| 102 | AS207957 | ServHost-AS SERV.HOST GROUP LTD | 168 | 43,008 | 26 |
| 103 | AS212655 | youfibre YouFibre Limited | 37 | 43,008 | 3 |
| 104 | AS41012 | THECLOUD The Cloud Networks Limited | 10 | 42,240 | 0 |
| 105 | AS212465 | COMCAST-UK-2 Comcast International Holdings UK Limited | 12 | 41,984 | 8 |
| 106 | AS50292 | STRATOGEN Access UK Ltd | 37 | 41,472 | 0 |
| 107 | AS8622 | ISIONUK TEAM BLUE INTERNET SERVICES UK LIMITED | 5 | 41,216 | 1 |
| 108 | AS20738 | GD-EMEA-DC-LD5 Heart Internet limited | 76 | 40,960 | 3 |
| 109 | AS33920 | AQL (aq) networks limited | 8 | 40,960 | 1 |
| 110 | AS34920 | Simply-Romford Team Blue Carrier Limited | 13 | 40,960 | 1 |
| 111 | AS49572 | FCN Fujitsu Services Ltd. | 3 | 40,960 | 1 |
| 112 | AS214432 | NTT-Communications-Corporation Zhilian Technology CO., LTD. | 146 | 39,424 | 6 |
| 113 | AS51320 | wirelesslogic-uk Wireless Logic Limited | 30 | 39,424 | 0 |
| 114 | AS8435 | LBG_INTERNET_EDGE Lloyds Banking Group PLC | 47 | 39,168 | 0 |
| 115 | AS5555 | SOHONETEU-AS Sohonet Limited | 31 | 37,888 | 1 |
| 116 | AS6660 | CWASIA Vodafone Enterprise Equipment Limited | 7 | 37,888 | 1 |
| 117 | AS39545 | FLUIDATA Fluidone Ltd. | 6 | 37,376 | 1 |
| 118 | AS215439 | PLAY2GO-NET PLAY2GO INTERNATIONAL LIMITED | 139 | 37,120 | 7 |
| 119 | AS61231 | Neos-Networks Neos Networks Limited | 8 | 36,864 | 1 |
| 120 | AS199741 | TRANSITX-BYOIP-Customers TransitX Ltd | 137 | 36,352 | 2 |
| 121 | AS49425 | DIGITAL-REALTY-UK Digital Realty (UK) Limited | 9 | 36,096 | 1 |
| 122 | AS203346 | AS-232WEB Proper Support LLP | 99 | 36,096 | 0 |
| 123 | AS49915 | MEGAPORT Megaport (UK) Limited | 87 | 35,840 | 52 |
| 124 | AS31463 | FourD-AS Redcentric Solutions Ltd | 33 | 34,560 | 5 |
| 125 | AS29017 | GYRON NTT Global Data Centers EMEA UK Ltd. | 10 | 34,560 | 1 |
| 126 | AS61112 | AkileCloud AKILE LTD | 144 | 34,304 | 32 |
| 127 | AS24916 | ORBITAL-ASN Orbital Net Ltd | 25 | 34,048 | 1 |
| 128 | AS25135 | vodafone_uk_asn Vodafone Limited | 25 | 33,792 | 1 |
| 129 | AS207995 | LightningFibre LF Holdco 2 Limited | 3 | 33,792 | 1 |
| 130 | AS41678 | TIBUS The Internet Business Ltd | 18 | 33,280 | 0 |
| 131 | AS9115 | INFB-AS9115 Hostpapa UK Ltd. | 4 | 33,024 | 2 |
| 132 | AS43937 | PTNET Playtech Software Ltd | 128 | 32,768 | 16 |
| 133 | AS51704 | SWGFL RM Education Ltd | 1 | 32,768 | 1 |
| 134 | AS39550 | KPMG-UK-LLP-AS KPMG LLP | 4 | 32,768 | 0 |
| 135 | AS13009 | VDATA Redcentric Solutions Ltd | 28 | 32,000 | 2 |
| 136 | AS31708 | COREIX-UK-AS Coreix Ltd | 23 | 32,000 | 2 |
| 137 | AS57099 | QUICKLINE Quickline Communications Limited | 15 | 31,232 | 1 |
| 138 | AS34010 | YAHOO-IRD Yahoo-UK Limited | 45 | 30,976 | 7 |
| 139 | AS51809 | BRSK BRSK Limited | 39 | 30,976 | 1 |
| 140 | AS199335 | TALKSTRAIGHT Talk Straight Ltd. | 22 | 30,464 | 1 |
| 141 | AS215590 | XORA-AS DpkgSoft International Limited | 118 | 30,208 | 3 |
| 142 | AS15412 | FLAG-AS Flag Telecom UK Limited | 19 | 30,208 | 1 |
| 143 | AS213607 | WORLD-FIRST-COMMUNICATION-LTD WORLD FIRST COMMUNICATION LTD | 107 | 28,928 | 1 |
| 144 | AS213877 | U1DS-AS U1 DIGITAL SERVICES LTD | 112 | 28,672 | 3 |
| 145 | AS12519 | FASTNETUK FastNet International Ltd | 4 | 28,672 | 1 |
| 146 | AS42081 | ecmwf-it European Centre for Medium-Range Weather Forecasts (ECMWF) | 7 | 28,416 | 2 |
| 147 | AS200740 | FIRST-SERVER-EU-AS FIRST SERVER LIMITED | 59 | 27,904 | 19 |
| 148 | AS41811 | CONVERGENCE-GROUP CONVERGENCE (GROUP NETWORKS) LIMITED | 17 | 27,904 | 1 |
| 149 | AS39537 | HNS SysGroup plc | 23 | 27,392 | 3 |
| 150 | AS206347 | RANSTON-AS-1 Wessex Internet Limited | 33 | 26,880 | 0 |
| 151 | AS209641 | I-SERVERS-EAST IHOR HOSTING LTD | 74 | 26,624 | 28 |
| 152 | AS34442 | AMATISNETWORKS BNW TECHNOLOGY LTD | 21 | 26,624 | 1 |
| 153 | AS25098 | NETCALIBRE Netcalibre Ltd | 12 | 25,856 | 2 |
| 154 | AS15570 | INAP-LON PACKETFABRIC (UK) LTD | 16 | 25,856 | 1 |
| 155 | AS210874 | box-broadband Box Broadband Limited | 4 | 25,600 | 1 |
| 156 | AS209341 | WHG-FRA WHG Hosting Services Ltd | 34 | 25,344 | 0 |
| 157 | AS9002 | RETN-AS RETN Limited | 14 | 25,088 | 1 |
| 158 | AS9153 | BURSTFIRE-EU Burstfire Networks Ltd | 3 | 25,088 | 1 |
| 159 | AS39921 | DE-RACKSPACE Rackspace Ltd. | 8 | 24,832 | 2 |
| 160 | AS5552 | DIALNET-UK Redcentric Solutions Ltd | 3 | 24,832 | 1 |
| 161 | AS49158 | WIFINITY WIFINITY NETWORKS LIMITED | 7 | 24,576 | 1 |
| 162 | AS202282 | Fibrus FIBRUS NETWORKS LTD | 15 | 24,576 | 1 |
| 163 | AS56595 | FLUENCY Commsworld Ltd | 36 | 24,320 | 2 |
| 164 | AS216138 | SKYQUANTUM-TELECOM SKYQUANTUM TELECOM LTD. | 79 | 24,064 | 52 |
| 165 | AS199468 | Solway-Comms-UK GRAIN COMMUNICATIONS LIMITED | 5 | 23,808 | 2 |
| 166 | AS49765 | Comms365 Comms365 Limited | 83 | 23,552 | 0 |
| 167 | AS58273 | B4RN-AS Broadband for the Rural North Limited. | 48 | 23,296 | 21 |
| 168 | AS198440 | Giganet AllPoints Fibre Networks Limited | 10 | 23,296 | 1 |
| 169 | AS212286 | LONCONNECT LonConnect Ltd | 26 | 23,040 | 1 |
| 170 | AS30914 | IOKO-AS Redcentric Solutions Ltd | 7 | 22,784 | 0 |
| 171 | AS216127 | NUXT-AS INTERNATIONAL HOSTING COMPANY LIMITED | 88 | 22,528 | 5 |
| 172 | AS24958 | TBSH CYBERFORT LIMITED | 24 | 22,528 | 1 |
| 173 | AS210546 | CHSL-ONE CHSL ONE LTD | 88 | 22,528 | 1 |
| 174 | AS16353 | Merula Merula Limited | 18 | 22,016 | 4 |
| 175 | AS34555 | CCS-Leeds-ASN C.C.S. (Leeds) Ltd | 17 | 21,504 | 1 |
| 176 | AS50957 | MEMSET MEMSET Ltd | 8 | 21,504 | 1 |
| 177 | AS44022 | BARCLAYS-RETAIL Barclays Bank PLC | 20 | 21,504 | 0 |
| 178 | AS47264 | LDEX Iomart Managed Services Limited | 34 | 20,992 | 3 |
| 179 | AS12496 | IDNET Infinity Developments Limited | 6 | 20,992 | 2 |
| 180 | AS15641 | Arqiva Arqiva Communications Ltd | 16 | 20,992 | 0 |
| 181 | AS51263 | COUNTYBB County Broadband Ltd | 14 | 20,480 | 1 |
| 182 | AS50131 | SPARTANHOST Spartan Host Ltd | 66 | 19,968 | 37 |
| 183 | AS30967 | TRUPHONE-LTD TP Global Operations Limited | 30 | 19,968 | 0 |
| 184 | AS51918 | CERBERUSNETWORKS-AS Cerberus Networks Ltd | 24 | 19,712 | 2 |
| 185 | AS51551 | CAPITA-AS Capita Business Services Ltd | 4 | 19,712 | 0 |
| 186 | AS45014 | NCONNECT Nuco Technologies Ltd | 30 | 19,456 | 6 |
| 187 | AS60426 | WIGHTFIBRE WightFibre Limited | 9 | 19,456 | 2 |
| 188 | AS58325 | BANDWIDTH-ASIA Hydra Communications Ltd | 23 | 19,456 | 1 |
| 189 | AS57356 | HIGHNET-AS Highland Network Ltd | 33 | 19,456 | 0 |
| 190 | AS42228 | Brightstar Brightstar Limited | 10 | 19,200 | 2 |
| 191 | AS43949 | MMC Marsh Limited | 11 | 19,200 | 0 |
| 192 | AS3170 | VELOXSERV VeloxServ Communications Ltd | 72 | 18,688 | 13 |
| 193 | AS5500 | CHESS Chess ICT Ltd | 9 | 18,432 | 3 |
| 194 | AS6717 | AS6717 Internet Central Limited | 5 | 18,432 | 1 |
| 195 | AS42611 | ZZOOMM Full Fibre Limited | 5 | 18,432 | 1 |
| 196 | AS39116 | Telehouse Telehouse International Corporation of Europe Ltd | 14 | 18,432 | 0 |
| 197 | AS60819 | SAFENAMES-AS Safenames Ltd. | 63 | 17,920 | 2 |
| 198 | AS213915 | HOSTES-AS HOSTES LTD | 70 | 17,920 | 0 |
| 199 | AS207456 | PANGEA-CONNECTED Pangea Connected Limited | 24 | 17,664 | 0 |
| 200 | AS12488 | KRYSTAL Krystal Hosting Ltd | 20 | 17,408 | 5 |
AS names and routing data: RIPE NCC (asn.txt, RIS). A prefix counts when at least 10 RIS peers see it. Data as of Oct 21, 2026. Countries are those of the AS registrations.