AS2856 BTnet (BT's UK IP Network - AS2856)
AS2856 is operated by BTnet (BT's UK IP Network - AS2856) and registered with RIPE NCC (GB) since 1993-12-22.
It announces 550 IPv4 and 7 IPv6 prefixes, 70% of them RPKI valid.
RIPE RIS sees 22 upstream and peer networks and 216 downstream networks next to it.
PeeringDB lists it as an NSP network at 2 internet exchanges and 3 facilities. Its peering policy is selective.
| Name | BTnet (BT's UK IP Network - AS2856) |
|---|---|
| Registry (RIR) | RIPE NCC |
| Country | United Kingdom (GB) |
| Delegated on | 1993-12-22 |
| Network type | NSP, Regional |
| Peering policy | Selective |
| IRR as-set | RIPE::AS-BTGB |
| Prefixes (IPv4 / IPv6) | 550 / 7 |
| RPKI valid | 70% (391 / 557) |
| Upstreams and peers | 22 |
| Downstream networks | 216 |
| Website | bt.net |
Routing health
- AS2856 announces 550 IPv4 and 7 IPv6 prefixes.
- 391 of 557 announced prefixes are RPKI valid.
- 166 announced prefixes are not covered by a ROA of AS2856 (they may have none, or another network’s).
- 22 upstreams and peers, 216 downstream networks seen.
For every check with the fix (IRR route objects, the RPKI state of each route, reverse DNS and the registration), run the full network report.
Announced prefixes 557
- 5.35.192.0/21
- 5.80.0.0/15
- 5.81.0.0/16
- 5.181.136.0/24
- 9.151.0.0/19
- 9.151.208.0/20
- 9.151.248.0/21
- 9.232.192.0/18
- 9.233.48.0/20
- 9.237.96.0/19
- 9.237.128.0/18
- 9.237.192.0/19
- 15.145.20.0/22
- 23.26.70.0/24
- 23.26.108.0/24
- 23.26.117.0/24
- 23.26.131.0/24
- 23.26.192.0/24
- 23.27.32.0/24
- 23.27.33.0/24
- 23.27.34.0/24
- 23.27.35.0/24
- 23.27.36.0/24
- 23.27.37.0/24
- 23.27.38.0/24
- 23.27.39.0/24
- 23.27.40.0/24
- 23.27.102.0/24
- 23.27.103.0/24
- 23.27.104.0/24
- 23.27.105.0/24
- 23.27.106.0/24
- 23.27.107.0/24
- 23.27.108.0/24
- 23.230.82.0/23
- 23.230.242.0/24
- 23.230.252.0/24
- 31.48.0.0/13
- 31.90.0.0/15
- 31.92.0.0/15
- 31.94.0.0/16
- 31.96.0.0/16
- 31.100.0.0/14
- 31.104.0.0/16
- 31.106.0.0/15
- 31.112.0.0/14
- 31.116.0.0/14
- 31.116.0.0/16
- 31.117.0.0/16
- 31.118.0.0/16
- 31.119.0.0/16
- 31.120.0.0/16
- 31.121.0.0/16
- 31.122.0.0/15
- 31.124.0.0/16
- 31.126.0.0/15
- 31.130.240.0/23
- 37.44.229.0/24
- 37.44.230.0/24
- 37.44.231.0/24
- 37.97.112.0/22
- 37.143.0.0/22
- 37.230.61.0/24
- 40.27.28.0/24
- 40.27.72.0/24
- 45.39.116.0/24
- 45.39.188.0/24
- 45.149.7.0/24
- 45.149.168.0/23
- 45.149.170.0/23
- 46.68.0.0/15
- 46.68.66.0/24
- 46.248.96.0/22
- 46.248.102.0/23
- 46.248.104.0/23
- 46.248.120.0/22
- 50.117.7.0/24
- 50.117.51.0/24
- 50.118.154.0/23
- 51.14.0.0/16
- 51.64.32.0/24
- 51.64.33.0/24
- 51.64.34.0/24
- 51.64.35.0/24
- 51.146.44.0/22
- 51.146.128.0/22
- 51.146.136.0/22
- 51.146.235.0/24
- 51.146.252.0/22
- 51.149.18.0/24
- 51.149.19.0/24
- 51.194.36.0/23
- 51.194.100.0/22
- 51.230.0.0/20
- 51.230.16.0/20
- 51.230.32.0/20
- 51.230.48.0/20
- 51.230.64.0/20
- 51.230.80.0/20
- 51.230.96.0/20
Showing the first 100.
Upstreams and peers 22
The networks RIPE RIS sees next to AS2856 in BGP paths, the most visible first.
Peering
Peering policy: Selective. Suggested max-prefix limits: 1,100 IPv4, 100 IPv6. PeeringDB record
| Exchange | Ports | Speed | Route server |
|---|---|---|---|
| LINX LON1: Main | 3 | 500G | No |
| LINX LON2 | 2 | 200G | No |
| Facility | City | Country |
|---|---|---|
| Digital Realty London LHR20 | London | GB |
| Equinix LD5 - London, Slough | Slough | GB |
| Telehouse - London (Docklands North Two) | London | GB |
More about AS2856
Sources: RIR delegation data and PeeringDB (updated daily); routing from RIPEstat (RIPE NCC RIS and RPKI), refreshed daily. Routing data from 2026-11-12 05:30 UTC. The country is where the AS number was registered, not necessarily where the network operates.