Networks in the United Kingdom

2,261 autonomous systems are registered in the United Kingdom (GB). Together they announce 67,905,790 IPv4 addresses, 2.17% of the announced total, which ranks the United Kingdom #8 of 240 countries.

Autonomous systems2,2612,074 announce IPv4, 187 IPv6 only

IPv4 addresses67,905,7902.17% of announced IPv4 · #8 worldwide

Top 5 networks hold57.8%of United Kingdom's IPv4 space

IPv65,597 x /32 (366,849,291 x /48)1075 of 2261 networks (48%) announce IPv6

Small networks497announce a single /24 (256 addresses) or less

Look up AS2856, the largest network in GB Look up any IP or ASN

Top 50 networks in United Kingdom by IPv4 space

#ASNNetworkIPv4 addressesOf GB

1 AS2856 BT-UK-AS British Telecommunications Limited 13,859,584 20.41%

2 AS5089 NTL Virgin Media Limited 8,490,496 12.50%

3 AS786 JANET Jisc Services Limited 6,885,120 10.14%

4 AS5607 BSKYB-BROADBAND-AS Sky UK Limited 6,089,728 8.97%

5 AS13285 OPALTELECOM-AS TalkTalk Communications Limited 3,954,944 5.82%

6 AS5378 Vodafone Limited 2,523,136 3.72%

7 AS6871 Plusnet British Telecommunications Limited 2,097,664 3.09%

8 AS8220 COLT COLT Technology Services Group Limited 1,488,895 2.19%

9 AS212238 CDNEXT Datacamp Limited 1,066,496 1.57%

10 AS8426 CLARANET-AS Claranet Limited 904,704 1.33%

11 AS5413 Wavenet-AS5413 Wavenet Limited 732,416 1.08%

12 AS5400 BT British Telecommunications Limited 713,472 1.05%

13 AS31655 ASN-GammaTelecom Gamma Telecom Holdings Ltd 609,536 0.90%

14 AS206067 H3GUK Hutchison 3G UK Limited 529,152 0.78%

15 AS13037 ZEN-AS Zen Internet Ltd 527,616 0.78%

16 AS3300 BT British Telecommunications Limited 513,280 0.76%

17 AS42689 Glide Glide Student & Residential Limited 499,200 0.74%

18 AS8851 EDGE GCI Network Solutions Limited 417,792 0.62%

19 AS15395 RACKSPACE-LON Rackspace Ltd. 402,176 0.59%

20 AS20860 IOMART-AS IOMART CLOUD SERVICES LIMITED 379,136 0.56%

21 AS8468 ENTANET Cityfibre Limited 358,400 0.53%

22 AS62240 Clouvider Clouvider Limited 339,968 0.50%

23 AS25180 EXPONENTIAL-E-AS Exponential-E Ltd. 291,328 0.43%

24 AS30844 LIQUID-AS Liquid Telecommunications Ltd 275,712 0.41%

25 AS12390 KINGSTON-UK-AS KCOM Group Limited 249,856 0.37%

26 AS25310 ASN-CWACCESS Vodafone Limited 229,376 0.34%

27 AS201838 ASN-COMMUNITYFIBRE Community Fibre Limited 221,952 0.33%

28 AS8607 TIMICO Digital Space Group Limited 205,568 0.30%

29 AS35228 O2BROADBAND Telefonica UK Limited 201,728 0.30%

30 AS12703 PULSANT-AS Pulsant (Scotland) Ltd 183,040 0.27%

31 AS47474 Virtual1 Virtual1 Limited 153,344 0.23%

32 AS20712 AS20712 Andrews & Arnold Ltd 148,992 0.22%

33 AS15404 COLT Technology Services Group Limited 142,336 0.21%

34 AS56478 BCUBE-AS Hyperoptic Ltd 141,312 0.21%

35 AS198864 QMW-AC-UK Queen Mary University of London 132,864 0.20%

36 AS8698 NATIONWIDE BUILDING SOCIETY 131,072 0.19%

37 AS15914 British Airways plc 131,072 0.19%

38 AS60068 CDN77 Datacamp Limited 130,816 0.19%

39 AS25369 BANDWIDTH-AS Hydra Communications Ltd 125,696 0.19%

40 AS5587 ITILITY-LIMITED Itility Limited 121,856 0.18%

41 AS41354 its-tg ITS Technology Group Limited 117,248 0.17%

42 AS214143 skydigital-telecom SKYDIGITAL TELECOM LTD 116,992 0.17%

43 AS8586 OBSL-AS TalkTalk Communications Limited 108,032 0.16%

44 AS56329 GIGACLEAR Gigaclear Limited 106,496 0.16%

45 AS42831 UKSERVERS-AS UK Dedicated Servers Limited 106,240 0.16%

46 AS6908 DATAHOP Six Degrees Technology Group Limited 104,448 0.15%

47 AS3223 VOXILITY Voxility LLP 104,448 0.15%

48 AS58065 PacketExchange Orion Network Limited 104,448 0.15%

49 AS39326 HSO-GROUP Syntura Group Limited 103,936 0.15%

50 AS5503 RMIFL RM Education Ltd 99,328 0.15%

Countries of similar size

#5 South Korea #6 Brazil #7 France #9 Canada #10 Italy #11 Netherlands All countries

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources