OSN

Network

British Telecommunications Limited

AS2856registered in United Kingdom (GB)hosts in 6 countries

As of 2026-10-05, British Telecommunications Limited (AS2856, registered in United Kingdom) had 206 088 hosts seen in 6 countries; 2 834 of them with known CVEs (1 525 distinct, 12 known to be exploited). It announces 540 IPv4 prefixes and 6 IPv6 prefixes (13 931 264 IPv4 addresses, 30th by address space).

Known CVEs in this network

206 088hosts seen
2 834hosts with known CVEs
1 525distinct CVEs
12known exploited

CVEs by severity: CRITICAL 196 HIGH 477 MEDIUM 760 LOW 87 UNRATED 5

A match is an indication, not proof: it is based on the software version a service reported, and fixes are often backported without changing the version.

Not counted: 1 host with CVEs only from an older observation (software reported earlier, no service of that kind open now).

Counted 2026-10-05 16:20 UTC

Organisation
BTnet (BT's UK IP Network - AS2856)
Network type
Network service provider (transit) · peering policy Selective
Website
http://www.bt.net
Registry
RIPE NCC · United Kingdom GB · allocated 1993-12-22
Announced prefixes
540 IPv4 · 6 IPv6 See them
IPv4 address space
13 931 264 addresses · 30th of 87 256 networks by size
Rank by exposure
134th by hosts with known CVEs Ranking
Exchange points
2

Routing

Most common CVEs in this network

CVEHosts
CVE-2026-35385 HIGH 8.1 1 458
CVE-2026-35386 HIGH 8.1 1 458
CVE-2026-35414 HIGH 8.1 1 458
CVE-2026-35387 MEDIUM 6.5 1 458
CVE-2026-35388 LOW 2.5 1 458
CVE-2025-26465 MEDIUM 6.8 1 355
CVE-2023-48795 MEDIUM 5.9 1 297
CVE-2023-51385 MEDIUM 6.5 1 295
CVE-2023-38408 CRITICAL 9.8 1 284
CVE-2025-32728 LOW 3.8 1 156
CVE-2021-36368 LOW 3.7 1 046
CVE-2016-20012 MEDIUM 5.3 1 041
CVE-2021-41617 HIGH 7.0 938
CVE-2020-14145 MEDIUM 5.9 894
CVE-2020-15778 HIGH 7.4 710
CVE-2019-7659 HIGH 8.1 618
CVE-2019-6109 MEDIUM 6.8 546
CVE-2019-6110 MEDIUM 6.8 546
CVE-2019-6111 MEDIUM 5.9 546
CVE-2018-20685 MEDIUM 5.3 546
CVE-2024-6387 HIGH 8.1 528
CVE-2018-15473 MEDIUM 5.3 506
CVE-2017-15906 MEDIUM 5.3 469
CVE-2018-15919 MEDIUM 5.3 427
CVE-2021-28041 HIGH 7.1 417
CVE-2026-60002 HIGH 7.7 415
CVE-2026-60000 HIGH 7.5 415
CVE-2026-59998 MEDIUM 6.5 415
CVE-2026-60001 MEDIUM 6.5 415
CVE-2026-59999 MEDIUM 5.9 415
CVE-2026-59995 MEDIUM 5.4 415
CVE-2026-59996 MEDIUM 5.4 415
CVE-2026-59997 MEDIUM 5.4 415
CVE-2026-73282 MEDIUM 4.8 415
CVE-2026-73281 LOW 3.5 415
CVE-2026-73283 LOW 2.5 415
CVE-2025-61984 LOW 3.6 409
CVE-2025-61985 LOW 3.6 409
CVE-2016-10012 HIGH 7.8 346
CVE-2016-10708 HIGH 7.5 346
CVE-2016-10009 HIGH 7.3 346
CVE-2016-10010 HIGH 7.0 346
CVE-2016-10011 MEDIUM 6.2 346
CVE-2015-8325 HIGH 7.8 313
CVE-2016-6515 HIGH 7.5 313
CVE-2016-3115 MEDIUM 6.4 313
CVE-2016-6210 MEDIUM 5.9 313
CVE-2025-58098 HIGH 8.3 272
CVE-2025-49812 HIGH 7.4 261
CVE-2023-51384 MEDIUM 5.5 249

The 50 found on the most hosts, of 1 525 CVEs.

Most exposed hosts

IPExploitedCVEs
86.146.25.238 4 131 CVEs
86.138.163.109 3 209 CVEs
86.148.2.88 3 208 CVEs
109.158.112.22 3 178 CVEs
81.158.158.47 3 170 CVEs
217.36.221.146 3 143 CVEs
86.152.119.179 3 143 CVEs
95.148.119.49 3 141 CVEs
81.138.13.231 3 129 CVEs
81.142.190.58 3 126 CVEs
62.6.160.185 3 114 CVEs
86.136.6.184 3 114 CVEs
81.146.36.112 3 113 CVEs
86.135.210.38 3 113 CVEs
195.171.239.178 3 108 CVEs
81.142.190.59 3 108 CVEs
31.113.230.40 3 106 CVEs
86.139.196.93 3 106 CVEs
86.141.58.224 3 101 CVEs
86.179.195.211 3 101 CVEs
109.152.166.210 3 99 CVEs
81.149.224.155 3 99 CVEs
217.35.103.165 3 93 CVEs
31.121.41.29 3 93 CVEs
81.134.89.2 3 93 CVEs
86.129.179.17 3 93 CVEs
86.135.14.123 3 93 CVEs
86.174.196.186 3 93 CVEs
86.136.167.110 3 92 CVEs
109.148.69.16 3 91 CVEs
217.37.97.153 3 91 CVEs
86.130.82.114 3 91 CVEs
165.120.167.179 3 88 CVEs
81.137.209.47 3 85 CVEs
81.145.16.12 3 85 CVEs
31.104.43.44 3 83 CVEs
81.137.219.68 3 82 CVEs
81.147.23.255 3 82 CVEs
81.149.189.125 3 80 CVEs
81.131.3.179 3 74 CVEs
86.145.191.159 3 74 CVEs
95.148.170.236 3 74 CVEs
81.128.214.7 3 73 CVEs
81.133.19.126 3 73 CVEs
81.145.16.13 3 72 CVEs
81.145.16.14 3 72 CVEs
81.145.16.40 3 72 CVEs
81.149.248.215 3 71 CVEs
81.145.40.137 2 366 CVEs
86.158.182.19 2 335 CVEs
31.121.71.230 2 324 CVEs
31.119.1.89 2 292 CVEs
81.144.241.220 2 157 CVEs
86.174.218.155 2 157 CVEs
109.151.7.137 2 144 CVEs
62.7.82.197 2 144 CVEs
86.188.163.250 2 144 CVEs
86.188.178.153 2 144 CVEs
86.157.188.194 2 143 CVEs
86.188.178.119 2 140 CVEs
86.159.153.148 2 126 CVEs
109.149.158.76 2 122 CVEs
86.191.141.106 2 116 CVEs
194.72.180.250 2 115 CVEs
86.159.10.76 2 114 CVEs
86.173.112.95 2 109 CVEs
31.121.27.246 2 101 CVEs
86.156.85.240 2 101 CVEs
86.151.206.17 2 99 CVEs
185.68.201.14 2 98 CVEs
31.120.233.166 2 97 CVEs
86.129.193.88 2 96 CVEs
62.7.206.29 2 95 CVEs
81.149.79.255 2 87 CVEs
81.128.197.143 2 82 CVEs
81.128.197.144 2 82 CVEs
81.128.197.145 2 82 CVEs
81.128.197.146 2 82 CVEs
81.134.205.15 2 82 CVEs
81.136.213.148 2 82 CVEs
81.137.18.97 2 82 CVEs
81.143.213.180 2 82 CVEs
81.145.40.154 2 82 CVEs
217.38.160.106 2 81 CVEs
31.51.226.50 2 81 CVEs
81.137.247.46 2 81 CVEs
86.188.242.214 2 81 CVEs
109.154.199.195 2 79 CVEs
81.139.50.226 2 78 CVEs
81.156.40.145 2 78 CVEs
86.146.221.72 2 78 CVEs
81.142.221.213 2 77 CVEs
81.143.222.69 2 77 CVEs
81.150.69.66 2 77 CVEs
86.138.232.189 2 76 CVEs
81.150.157.154 2 71 CVEs
109.158.4.135 2 61 CVEs
81.133.34.91 2 61 CVEs
81.142.49.38 2 61 CVEs
81.143.222.65 2 61 CVEs

Known exploited first, then by the number of CVEs.

Showing the first 100 of 2 834. Complete lists will be available to registered users.

Where its hosts are

CountryHostsWith CVEs
United Kingdom GB 194 287 2 834
Canada CA 8 192 0
Germany DE 2 048 0
Netherlands NL 778 0
Norway NO 512 0
United States US 271 0
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