206208 looking glass

AS2856 British Telecommunications 🇬🇧 GB

British Telecommunications Limited. Announcing 550 prefixes, seen at the RIS collectors.

IPv4 prefixes
543
18,472,448 (72,158 × /24)
IPv6 prefixes
7
136 × /32
Upstreams
3
transit providers observed
Peers
10
settlement-free adjacencies
Downstreams
150
transit customers observed
Customer cone
162
ASes reachable through it

Registry and operator data

AS number
AS2856
Name
British Telecommunications
Organisation
BTnet (BT's UK IP Network - AS2856)
Country
🇬🇧 GB
RIR
RIPENCC
Allocated
1993-12-22
Network type
NSP
Traffic levels
1-5Tbps
Scope
Regional
Peering policy
Selective
IRR as-set
RIPE::AS-BTGB
Website
http://www.bt.net
PeeringDB
net/281
Exchanges
2
Facilities
3

RPKI coverage of this AS

Its own announcements, validated against the current ROA set

390 valid (70.9%) 3 invalid (0.5%) 157 no ROA (28.5%)

Announcement history

One point per day, recorded at each table import

013627240754309-1809-2309-2810-0310-0810-1310-1810-21
IPv4 IPv6

Recorded changes

New prefixes and origin changes seen on the live stream

WhenChangePrefixOriginPath
2026-10-21 17:22:35Z origin change 51.64.35.0/24 AS15404 → AS2856 4913453356642464612856
2026-10-21 17:22:35Z origin change 51.64.34.0/24 AS15404 → AS2856 4913453356642464612856
2026-10-21 17:22:35Z origin change 216.165.88.0/24 AS12 → AS2856 4913453356642464612856
2026-10-21 17:00:08Z origin change 51.64.35.0/24 AS2856 → AS15404 140357782201540415404154041540415404
2026-10-21 17:00:08Z origin change 51.64.34.0/24 AS2856 → AS15404 140357782201540415404154041540415404
2026-10-21 16:11:38Z origin change 216.165.88.0/24 AS2856 → AS12 612186939822012
2026-10-21 14:23:33Z new prefix 94.192.96.0/20 AS2856 British Telecommunications 202365506733389154002856
2026-10-21 14:23:33Z new prefix 94.193.112.0/20 AS2856 British Telecommunications 202365506733389154002856
2026-10-20 21:51:14Z origin change 216.165.88.0/24 AS12 → AS2856 5991990022856
2026-10-20 21:51:14Z origin change 51.64.35.0/24 AS15404 → AS2856 5991990022856
2026-10-20 21:51:14Z origin change 51.64.34.0/24 AS15404 → AS2856 5991990022856
2026-10-20 21:49:48Z origin change 51.64.35.0/24 AS2856 → AS15404 599191277982201540415404154041540415404
2026-10-20 21:49:48Z origin change 51.64.34.0/24 AS2856 → AS15404 599191277982201540415404154041540415404
2026-10-20 21:49:48Z origin change 216.165.88.0/24 AS2856 → AS12 5991912779822012
2026-10-20 21:49:04Z origin change 216.165.88.0/24 AS12 → AS2856 5991990022856
2026-10-20 21:49:04Z origin change 51.64.35.0/24 AS15404 → AS2856 5991990022856
2026-10-20 21:49:04Z origin change 51.64.34.0/24 AS15404 → AS2856 5991990022856
2026-10-20 21:48:42Z origin change 216.165.88.0/24 AS2856 → AS12 5991912779822012
2026-10-20 21:48:41Z origin change 51.64.35.0/24 AS2856 → AS15404 599191277982201540415404154041540415404
2026-10-20 21:48:41Z origin change 51.64.34.0/24 AS2856 → AS15404 599191277982201540415404154041540415404
2026-10-20 17:13:33Z origin change 216.165.88.0/24 AS12 → AS2856 32884032772717454002856
2026-10-20 11:56:10Z origin change 216.165.88.0/24 AS2856 → AS12 205141299822012
2026-10-18 00:11:01Z origin change 216.165.88.0/24 AS12 → AS2856 32884032772717454002856
2026-10-18 00:11:01Z origin change 51.64.34.0/24 AS15404 → AS2856 32884032772717454002856
2026-10-18 00:11:01Z origin change 51.64.35.0/24 AS15404 → AS2856 32884032772717454002856
2026-10-17 22:52:39Z origin change 216.165.88.0/24 AS2856 → AS12 14907822012
2026-10-17 22:52:36Z origin change 51.64.34.0/24 AS2856 → AS15404 1490782201540415404154041540415404
2026-10-17 22:52:36Z origin change 51.64.35.0/24 AS2856 → AS15404 1490782201540415404154041540415404
2026-10-17 09:58:59Z origin change 198.232.43.0/24 AS22283 → AS2856 20205693954002856
2026-10-17 08:30:24Z origin change 198.232.43.0/24 AS2856 → AS22283 49673315008732573049002285622283
2026-10-17 08:30:20Z origin change 198.232.43.0/24 AS22283 → AS2856 4967331500676254002856
2026-10-17 08:30:14Z origin change 198.232.43.0/24 AS2856 → AS22283 202365506739002285622283
2026-10-17 08:30:04Z origin change 198.232.43.0/24 AS22283 → AS2856 4967320485676254002856
2026-10-17 08:29:55Z origin change 198.232.43.0/24 AS2856 → AS22283 349279002285622283
2026-10-17 08:29:46Z origin change 198.232.43.0/24 AS22283 → AS2856 8522914335654002856
2026-10-17 08:29:45Z origin change 198.232.43.0/24 AS2856 → AS22283 491345335664246461285622283
2026-10-17 08:29:45Z origin change 198.232.43.0/24 AS22283 → AS2856 2950439392325754002856
2026-10-17 08:29:45Z origin change 198.232.43.0/24 AS2856 → AS22283 443932120246206285622283
2026-10-17 08:29:45Z origin change 198.232.43.0/24 AS22283 → AS2856 580571836174335654002856
2026-10-17 08:29:45Z origin change 198.232.43.0/24 AS2856 → AS22283 3492752025642896461285622283
2026-10-17 08:29:38Z origin change 198.232.43.0/24 AS22283 → AS2856 33331136683054002856
2026-10-17 08:29:37Z origin change 198.232.43.0/24 AS2856 → AS22283 5738150304285622283
2026-10-17 08:29:29Z origin change 198.232.43.0/24 AS2856 → AS22283 17639285622283
2026-10-17 08:29:29Z origin change 198.232.43.0/24 AS22283 → AS2856 3492752025325754002856
2026-10-17 08:29:28Z origin change 198.232.43.0/24 AS22283 → AS2856 450496696551154002856
2026-10-17 08:29:26Z origin change 198.232.43.0/24 AS2856 → AS22283 50304285622283
2026-10-17 08:29:15Z origin change 198.232.43.0/24 AS2856 → AS22283 599199002285622283
2026-10-17 08:29:15Z origin change 198.232.43.0/24 AS22283 → AS2856 4943248362176454052856
2026-10-17 08:29:15Z origin change 198.232.43.0/24 AS2856 → AS22283 49432483629002285622283
2026-10-17 08:29:15Z origin change 198.232.43.0/24 AS22283 → AS2856 34549645354002856
2026-10-17 08:29:15Z origin change 198.232.43.0/24 AS2856 → AS22283 48185285622283
2026-10-17 08:29:15Z origin change 198.232.43.0/24 AS22283 → AS2856 5805734549645354002856
2026-10-17 07:23:26Z origin change 216.165.88.0/24 AS12 → AS2856 32884032772717454002856
2026-10-16 16:08:38Z origin change 216.165.88.0/24 AS2856 → AS12 206499345491299822012
2026-10-16 06:32:04Z origin change 216.165.88.0/24 AS12 → AS2856 32884032772717454002856
2026-10-16 05:57:33Z origin change 216.165.88.0/24 AS2856 → AS12 349271299822012
2026-10-15 21:08:44Z origin change 216.165.88.0/24 AS12 → AS2856 55720325754002856
2026-10-15 21:07:13Z origin change 216.165.88.0/24 AS2856 → AS12 1403577822012
2026-10-15 21:05:38Z origin change 51.64.35.0/24 AS15404 → AS2856 32884032772717454002856
2026-10-15 21:05:38Z origin change 51.64.34.0/24 AS15404 → AS2856 32884032772717454002856
2026-10-15 21:05:37Z origin change 51.64.35.0/24 AS2856 → AS15404 140357782201540415404154041540415404
2026-10-15 21:05:37Z origin change 51.64.34.0/24 AS2856 → AS15404 140357782201540415404154041540415404
2026-10-15 19:46:20Z origin change 216.165.88.0/24 AS12 → AS2856 494324836290022856
2026-10-15 17:57:22Z origin change 216.165.88.0/24 AS2856 → AS12 557206939822012
2026-10-14 23:21:45Z origin change 216.165.88.0/24 AS12 → AS2856 496732048554002856
2026-10-14 23:18:20Z origin change 216.165.88.0/24 AS2856 → AS12 4967312389822012
2026-10-14 03:35:04Z origin change 216.165.88.0/24 AS12 → AS2856 32884032772717454002856
2026-10-14 03:34:36Z origin change 51.64.34.0/24 AS15404 → AS2856 32884032772717454002856
2026-10-14 03:34:36Z origin change 51.64.35.0/24 AS15404 → AS2856 32884032772717454002856
2026-10-14 03:32:37Z origin change 216.165.88.0/24 AS2856 → AS12 3798956300132132822012
2026-10-14 03:32:36Z origin change 51.64.35.0/24 AS2856 → AS15404 379895630013213282201540415404154041540415404
2026-10-14 03:32:36Z origin change 51.64.34.0/24 AS2856 → AS15404 379895630013213282201540415404154041540415404
2026-10-13 07:53:32Z origin change 77.90.145.0/24 AS2856 → AS42821 8521743492742821
2026-10-13 07:52:30Z origin change 77.90.145.0/24 AS42821 → AS2856 55720325754002856
2026-10-13 07:52:04Z origin change 77.90.145.0/24 AS2856 → AS42821 4913453356642464611743492742821
2026-10-13 07:52:00Z origin change 77.90.145.0/24 AS42821 → AS2856 55720325754002856
2026-10-13 07:51:56Z origin change 77.90.184.0/24 AS2856 → AS42821 450496696676254053492742821
2026-10-13 07:51:52Z origin change 77.90.184.0/24 AS42821 → AS2856 380017473645354002856
2026-10-13 07:51:50Z origin change 77.90.184.0/24 AS2856 → AS42821 205141299325754053492742821
2026-10-13 07:51:50Z origin change 77.90.145.0/24 AS2856 → AS42821 2051412991743492742821
2026-10-13 07:51:50Z origin change 77.90.153.0/24 AS2856 → AS42821 2051412991743492742821
2026-10-13 07:51:48Z origin change 77.90.145.0/24 AS42821 → AS2856 58057183654002856
2026-10-13 07:51:48Z origin change 77.90.153.0/24 AS42821 → AS2856 58057183654002856
2026-10-13 07:51:48Z origin change 77.90.184.0/24 AS42821 → AS2856 58057183654002856
2026-10-13 07:51:37Z origin change 77.90.184.0/24 AS42821 → AS2856 22652129954002856
2026-10-13 07:51:36Z origin change 77.90.184.0/24 AS2856 → AS42821 226521299325754053492742821
2026-10-13 07:51:36Z origin change 77.90.153.0/24 AS2856 → AS42821 226521743492742821
2026-10-13 07:51:36Z origin change 77.90.145.0/24 AS2856 → AS42821 226521743492742821
2026-10-13 07:51:36Z origin change 77.90.184.0/24 AS2856 → AS42821 496732048554053492742821
2026-10-13 07:51:34Z origin change 77.90.184.0/24 AS2856 → AS42821 599191277954053492742821
2026-10-13 07:51:34Z origin change 77.90.153.0/24 AS42821 → AS2856 496732048554002856
2026-10-13 07:51:34Z origin change 77.90.145.0/24 AS42821 → AS2856 496732048554002856
2026-10-13 07:51:34Z origin change 77.90.184.0/24 AS42821 → AS2856 496732048554002856
2026-10-13 07:49:19Z origin change 77.90.184.0/24 AS42821 → AS2856 380019002129954002856
2026-10-13 07:47:52Z origin change 77.90.184.0/24 AS2856 → AS42821 3798956300132132465754053492742821
2026-10-13 07:47:51Z origin change 77.90.184.0/24 AS42821 → AS2856 2950439392129954002856
2026-10-13 07:47:23Z origin change 77.90.153.0/24 AS2856 → AS42821 5572029141743492742821
2026-10-13 07:46:58Z origin change 77.90.184.0/24 AS2856 → AS42821 35493356325754053492742821
2026-10-13 07:46:56Z origin change 77.90.153.0/24 AS42821 → AS2856 852129954002856
2026-10-13 07:46:56Z origin change 77.90.184.0/24 AS42821 → AS2856 852129954002856