AS2856 British Telecommunications Limited

United Kingdom BT-UK-AS RIPE 543 IPv4 prefixes 7 IPv6 prefixes
IPv4 addresses
13,938,944
IPv6 /48 networks
8,912,900
RPKI
393 valid157 no ROA
Peers and downstreams
404

Holder

AS name
BT-UK-AS
Description
BTnet UK Regional network
Organisation
British Telecommunications Limited
Registered in
Ipswich, United Kingdom
Abuse contact
abuse@bt.com
Assigned
1993-12-21
Registered
2002-08-30
Record last changed
2026-07-21 10:58 UTC
109.144.0.0/12109.180.0.0/15109.205.158.0/24109.249.0.0/16132.146.0.0/16132.153.244.0/24132.153.245.0/24132.153.246.0/24132.153.247.0/24132.153.248.0/24132.153.249.0/24132.153.250.0/24132.153.251.0/24132.153.252.0/24132.153.253.0/24132.153.254.0/24132.153.3.0/24132.244.79.0/24138.108.94.0/24142.205.162.0/23143.223.132.0/24144.177.74.0/23144.87.0.0/20144.87.128.0/17144.87.16.0/20144.87.24.0/21144.87.24.0/22144.87.28.0/22145.79.172.0/22147.148.0.0/14147.152.0.0/16147.189.68.0/22147.189.76.0/22147.78.68.0/22147.90.115.0/24147.90.127.0/24147.90.32.0/24147.90.36.0/24147.90.55.0/24148.252.3.0/24148.252.7.0/24148.253.220.0/23149.117.130.0/24149.254.0.0/16149.254.1.0/2415.145.20.0/22151.240.180.0/22151.240.184.0/22151.240.188.0/22151.240.192.0/22151.240.196.0/22151.240.200.0/22151.241.180.0/22151.241.184.0/22151.241.188.0/22151.241.192.0/22151.241.196.0/22151.241.200.0/22151.241.52.0/22151.241.56.0/22151.241.60.0/22151.242.24.0/24151.242.42.0/24151.243.254.0/24151.244.204.0/22151.244.208.0/22151.244.80.0/22151.245.204.0/22151.245.208.0/22151.245.80.0/22151.246.145.0/24151.246.239.0/24151.247.220.0/24151.247.231.0/24151.247.245.0/24152.114.196.0/24152.114.220.0/23152.114.222.0/23156.146.3.0/24157.236.254.0/23157.236.254.0/24157.236.255.0/24159.180.96.0/19159.197.13.0/24159.197.44.0/24159.197.45.0/24159.253.66.0/23161.104.0.0/21163.5.115.0/24163.5.122.0/24163.5.208.0/24163.5.217.0/24163.5.222.0/24163.5.249.0/24163.5.37.0/24163.5.67.0/24163.5.98.0/24164.134.1.0/24164.134.134.0/24164.134.135.0/24164.134.136.0/24164.134.137.0/24164.134.138.0/24164.38.12.0/24164.38.120.0/22164.38.134.0/24164.38.148.0/24164.38.149.0/24164.38.156.0/24164.38.16.0/22164.38.184.0/22164.38.196.0/24164.38.197.0/24164.38.2.0/24164.38.31.0/24164.38.32.0/24164.38.33.0/24164.38.34.0/24165.120.0.0/16166.88.17.0/24166.88.18.0/24166.88.200.0/24166.88.32.0/24167.148.60.0/22178.212.56.0/23178.78.106.0/23178.78.108.0/22178.78.112.0/21178.78.120.0/21178.92.112.0/22178.92.180.0/22178.93.104.0/22178.94.244.0/22178.95.60.0/22185.128.205.0/24185.149.6.0/24185.177.64.0/23185.230.13.0/24185.230.15.0/24185.58.165.0/24185.68.200.0/22185.90.32.0/22188.172.160.0/21188.172.168.0/21188.220.122.0/24188.220.151.0/24188.220.157.0/24188.220.167.0/24188.220.194.0/24188.220.212.0/24188.220.229.0/24188.221.168.0/24188.221.177.0/24188.221.184.0/24188.221.188.0/24188.221.210.0/24192.12.73.0/24192.152.14.0/24192.177.94.0/23192.53.46.0/24192.65.219.0/24192.65.221.0/24192.65.222.0/24192.65.223.0/24192.65.224.0/24192.65.225.0/24192.65.226.0/24192.65.227.0/24192.65.228.0/24192.8.112.0/24192.8.149.0/24193.111.18.0/24193.111.19.0/24193.113.0.0/16193.138.107.0/24193.187.140.0/22193.195.138.0/24193.23.32.0/24193.32.46.0/24193.32.48.0/24193.33.199.0/24193.35.128.0/20193.35.158.0/23193.35.160.0/23193.35.197.0/24193.35.220.0/22193.36.240.0/24193.36.243.0/24193.36.253.0/24193.36.78.0/23193.36.80.0/22193.36.80.0/24193.37.142.0/24193.37.160.0/20193.38.192.0/19193.38.192.0/22193.38.192.0/23193.38.194.0/23193.39.141.0/24193.84.142.0/24193.9.26.0/24194.101.69.0/24194.102.0.0/19194.132.24.0/24194.132.25.0/24194.155.58.0/24194.169.32.0/21194.189.186.0/23194.189.44.0/24194.227.120.0/24194.227.72.0/24194.227.73.0/24194.246.78.0/24194.32.20.0/22194.32.207.0/24194.32.29.0/24194.32.31.0/24194.35.183.0/24194.36.135.0/24194.36.68.0/24194.59.188.0/24194.60.136.0/24194.60.137.0/24194.60.138.0/24194.60.139.0/24194.72.0.0/14195.104.240.0/24195.130.11.0/24195.130.12.0/24195.130.13.0/24195.130.14.0/24195.130.15.0/24195.130.3.0/24195.130.6.0/24195.171.0.0/16195.182.62.0/24195.218.32.0/19195.35.123.0/24195.36.106.0/24195.88.20.0/24195.99.0.0/16198.178.235.0/24198.232.43.0/24205.239.40.0/23205.239.42.0/24207.180.43.0/24209.101.8.0/23212.134.124.0/22212.134.164.0/22212.134.208.0/22212.134.224.0/22212.134.46.0/24212.134.52.0/24212.134.54.0/24212.140.0.0/16212.148.1.0/24212.212.16.0/22212.82.0.0/19213.1.0.0/16213.120.0.0/14213.169.196.0/23213.169.202.0/23213.190.16.0/23213.190.18.0/23213.205.192.0/18213.205.208.0/20213.209.146.0/24213.209.149.0/24213.209.150.0/24213.249.188.0/22216.120.189.0/24216.165.88.0/24217.15.64.0/20217.217.36.0/22217.217.56.0/22217.217.60.0/22217.31.10.0/23217.31.9.0/24217.32.0.0/1223.230.242.0/2423.230.252.0/2423.230.82.0/2323.26.108.0/2423.26.117.0/2423.26.131.0/2423.26.192.0/2423.26.70.0/2423.27.102.0/2423.27.103.0/2423.27.104.0/2423.27.105.0/2423.27.106.0/2423.27.107.0/2423.27.108.0/2423.27.32.0/2423.27.33.0/2423.27.34.0/2423.27.35.0/2423.27.36.0/2423.27.37.0/2423.27.38.0/2423.27.39.0/2423.27.40.0/2431.100.0.0/1431.104.0.0/1631.106.0.0/1531.112.0.0/1431.116.0.0/1431.116.0.0/1631.117.0.0/1631.118.0.0/1631.119.0.0/1631.120.0.0/1631.121.0.0/1631.122.0.0/1531.124.0.0/1631.126.0.0/1531.130.240.0/2331.48.0.0/1331.90.0.0/1531.92.0.0/1531.94.0.0/1631.96.0.0/1637.143.0.0/2237.230.61.0/2437.44.229.0/2437.44.230.0/2437.44.231.0/2437.97.112.0/2240.27.28.0/2440.27.72.0/2445.149.168.0/2345.149.170.0/2345.149.7.0/2445.39.116.0/2445.39.188.0/2446.248.102.0/2346.248.104.0/2346.248.120.0/2246.248.96.0/2246.68.0.0/1546.68.66.0/245.181.136.0/245.35.192.0/215.80.0.0/155.81.0.0/1650.117.51.0/2450.117.7.0/2450.118.154.0/2351.14.0.0/1651.146.128.0/2251.146.136.0/2251.146.235.0/2451.146.252.0/2251.146.44.0/2251.149.18.0/2451.149.19.0/2451.194.100.0/2251.194.36.0/2351.230.0.0/2051.230.112.0/2051.230.16.0/2051.230.255.0/2451.230.32.0/2051.230.48.0/2051.230.64.0/2051.230.80.0/2051.230.96.0/2051.241.201.0/2451.241.3.0/2451.64.32.0/2451.64.34.0/2451.64.35.0/2462.172.0.0/1662.192.124.0/2362.239.0.0/1662.244.11.0/2462.244.12.0/2462.244.29.0/2462.244.36.0/2462.244.37.0/2462.244.41.0/2462.244.43.0/2462.244.45.0/2462.244.56.0/2462.6.0.0/1662.7.0.0/1664.205.136.0/2264.205.144.0/2272.9.180.0/2277.90.135.0/2477.90.138.0/2477.90.145.0/2477.90.151.0/2477.90.153.0/2477.90.164.0/2477.90.184.0/2477.94.224.0/2478.105.136.0/2278.105.151.0/2478.105.175.0/2478.105.179.0/2478.105.188.0/2478.105.191.0/2478.105.194.0/2478.105.198.0/2478.105.200.0/2478.105.202.0/2478.105.97.0/2479.132.64.0/2479.132.65.0/2479.139.52.0/2379.139.54.0/2380.81.58.0/2481.128.0.0/1181.128.0.0/1281.161.52.0/2282.108.102.0/2382.108.116.0/2282.108.140.0/2282.108.152.0/2382.108.32.0/2182.108.4.0/2282.108.44.0/2282.108.52.0/2282.108.68.0/2282.108.88.0/2382.108.92.0/2282.136.54.0/2382.140.134.0/2482.140.138.0/2482.140.143.0/2482.140.170.0/2482.153.179.0/2482.153.181.0/2482.153.190.0/2482.153.238.0/2482.153.33.0/2482.153.85.0/2482.153.88.0/2482.38.56.0/2282.38.9.0/2482.39.173.0/2482.41.112.0/2283.223.153.0/2483.223.154.0/2483.245.16.0/2183.245.24.0/2284.23.0.0/1984.46.177.0/2484.46.181.0/2484.46.183.0/2484.46.188.0/2484.46.190.0/2484.46.191.0/2484.46.194.0/2484.55.17.0/2484.55.22.0/2485.189.132.0/2385.189.153.0/2485.189.154.0/2385.189.156.0/2485.189.159.0/2485.189.160.0/2485.189.162.0/2485.189.164.0/2385.189.167.0/2485.189.174.0/2385.189.178.0/2485.189.181.0/2485.189.183.0/2485.189.189.0/2485.189.190.0/2385.189.72.0/2385.189.74.0/2385.189.76.0/2385.189.78.0/2385.204.160.0/2285.235.123.0/2485.88.224.0/2085.88.240.0/2386.110.57.0/2486.128.0.0/1086.128.0.0/1186.128.0.0/1286.38.118.0/2486.38.123.0/2486.38.148.0/2486.38.193.0/2486.38.233.0/2486.38.244.0/2486.38.56.0/2486.38.63.0/2486.38.65.0/2486.38.67.0/2486.38.68.0/2486.38.86.0/2486.38.93.0/2486.54.81.0/2487.232.114.0/2487.237.16.0/2187.76.183.0/2487.81.112.0/2087.86.24.0/2387.86.248.0/2289.117.183.0/2489.117.198.0/2489.117.203.0/2489.117.235.0/2489.145.172.0/2389.39.172.0/239.151.0.0/199.151.208.0/209.151.248.0/219.232.192.0/189.233.48.0/209.237.128.0/189.237.192.0/199.237.96.0/1991.102.189.0/2491.102.190.0/2491.102.191.0/2491.111.0.0/1691.142.128.0/2491.227.78.0/2491.230.16.0/2491.230.40.0/2491.236.216.0/2391.90.125.0/2491.90.127.0/2494.125.16.0/2494.125.17.0/2494.125.18.0/2494.125.19.0/2494.194.188.0/2294.194.200.0/2294.194.204.0/2294.194.240.0/2294.232.100.0/2294.26.64.0/2394.72.248.0/2195.144.0.0/1395.173.59.0/24

Upstream graph

Upstreams and their upstreams, from BGP paths

Network health

Grade B · 83/100
partly Prefixes covered by valid ROAs
393 of 550 announced prefixes are RPKI valid, 157 have no ROA.
18/25
pass No RPKI invalid announcements
None of the announcements is RPKI invalid.
10/10
pass Announces IPv6
7 IPv6 prefixes.
15/15
pass More than one upstream
2 upstreams seen in BGP.
10/10
pass Working abuse contact
abuse@bt.com is published.
15/15
fail Publishes a geofeed
No geofeed found. Without one, location databases have to guess.
0/10
pass No prefixes smaller than /24 or /48
All prefixes are /24 (IPv4) or /48 (IPv6) or larger.
10/10
pass Registry record maintained
Last changed 2026-07-21.
5/5

Routing changes

Last 30 days
2026-10-04 12:43 UTCNeighbour gone AS212655 downstream
2026-10-04 12:43 UTCNeighbour gone AS202275 peer
2026-10-04 12:43 UTCNeighbour gone AS35200 downstream
2026-10-04 12:43 UTCNeighbour gone AS19812 peer
2026-10-04 12:43 UTCNeighbour gone AS16265 downstream
2026-10-04 12:43 UTCNeighbour gone AS13458 peer
2026-10-04 12:43 UTCNeighbour gone AS12222 downstream
2026-10-04 12:43 UTCNeighbour gone AS2686 downstream
2026-10-04 12:43 UTCNeighbour gone AS2119 downstream
2026-10-04 12:43 UTCNeighbour gone AS72 peer
2026-10-04 12:43 UTCNew neighbour AS50948 peer
2026-10-04 12:43 UTCNew neighbour AS45014 downstream
2026-10-04 12:43 UTCNew neighbour AS34344 peer
2026-10-04 12:43 UTCNew neighbour AS33879 peer
2026-10-04 12:43 UTCNew neighbour AS32787 downstream
2026-10-04 12:43 UTCNew neighbour AS218625 peer
2026-10-04 12:43 UTCNew neighbour AS213786 peer
2026-10-04 12:43 UTCNew neighbour AS197545 peer
2026-10-04 12:43 UTCNew neighbour AS19551 downstream
2026-10-04 12:43 UTCNew neighbour AS12390 downstream
2026-10-04 12:43 UTCNew neighbour AS10235 peer
2026-10-04 12:43 UTCRelationship changed AS8966 upstream to peer
2026-10-04 12:43 UTCRelationship changed AS6461 upstream to peer
2026-10-04 12:43 UTCRelationship changed AS6206 upstream to peer
2026-10-04 12:43 UTCRelationship changed AS6204 upstream to peer
2026-10-04 12:43 UTCRelationship changed AS5405 upstream to downstream
2026-10-04 12:43 UTCRelationship changed AS4455 upstream to downstream
2026-10-04 12:43 UTCRelationship changed AS30844 upstream to peer
2026-10-04 12:43 UTCRelationship changed AS215638 upstream to peer
2026-10-04 12:43 UTCRelationship changed AS13030 upstream to downstream
2026-10-04 12:43 UTCPrefix gone 144.87.128.0/18
2026-10-04 12:43 UTCPrefix gone 144.87.0.0/21
2026-10-04 12:43 UTCNew prefix 87.86.248.0/22
2026-10-04 12:43 UTCNew prefix 94.194.240.0/22
2026-10-04 12:43 UTCNew prefix 94.194.200.0/22
2026-10-04 12:43 UTCNew prefix 94.194.188.0/22
2026-10-04 12:43 UTCNew prefix 94.194.204.0/22
2026-10-04 12:43 UTCNew prefix 87.81.112.0/20
2026-10-04 12:43 UTCNew prefix 194.101.69.0/24
2026-10-04 12:43 UTCNew prefix 144.87.128.0/17
2026-10-04 12:43 UTCNew prefix 193.9.26.0/24
2026-10-04 12:43 UTCNew prefix 144.87.0.0/20
2026-10-04 12:43 UTCNew prefix 194.189.186.0/23

WHOIS

aut-num:        AS2856
as-name:        BT-UK-AS
descr:          BTnet UK Regional network
org:            ORG-BPIS1-RIPE
admin-c:        FLS15-RIPE
tech-c:         BS1474-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
remarks:        
remarks:        Peering contact: http://www.bt.net/cgi-bin/peering-request
remarks:        Support contact: as2856peering@bt.com
remarks:        24*7 NMC contact: 0800 811 343 option 3
remarks:        BTnet abuse: abuse@bt.com
remarks:        
remarks:        ------------------------------------------------
mnt-by:         BTNET-INFRA-MNT
created:        2002-08-30T11:12:47Z
last-modified:  2026-07-21T10:58:29Z
source:         RIPE
% 152 routing policy lines (import/export) not shown