Network · data from 2026-11-12
AS13205 British Telecommunications Limited
Registry name: British Telecommunications Limited, GB · not in PeeringDB
Announced routes
Every prefix a peer of the route collectors sees with origin AS13205, things to look at first. Visibility = full-table peers that see it, of 673 (IPv4) and 636 (IPv6) on 75 collectors. Also as routes.csv.
| 137.213.239.0/24 | No ROA | None | 1 0%low visibility |
| 137.213.252.0/23 | No ROA | None | 1 0%low visibility |
| 31.11.56.0/23 | No ROA | RIR databaseRIPE | 673 100% |
| 78.109.0.0/20 | No ROA | RIR databaseRIPE | 673 100% |
| 78.109.0.0/24 | No ROA | RIR databaseRIPE | 673 100% |
| 78.109.5.0/24 | No ROA | RIR databaseRIPE | 673 100% |
| 78.109.6.0/24 | No ROA | RIR databaseRIPE | 673 100% |
| 78.109.7.0/24 | No ROA | RIR databaseRIPE | 673 100% |
| 78.109.9.0/24 | No ROA | RIR databaseRIPE | 673 100% |
| 78.109.10.0/24 | No ROA | RIR databaseRIPE | 673 100% |
| 78.109.11.0/24 | No ROA | RIR databaseRIPE | 673 100% |
| 217.140.0.0/20 | No ROA | RIR databaseRIPE | 673 100% |
| 217.140.12.0/22 | No ROA | RIR databaseRIPE | 673 100% |
| 217.140.12.0/24 | No ROA | RIR databaseRIPE | 673 100% |
| 217.140.13.0/24 | No ROA | RIR databaseRIPE | 673 100% |
| 217.140.32.0/19 | No ROA | RIR databaseRIPE | 673 100% |
AS-SET
AS13205 isn't in PeeringDB, where networks name their AS-SET.
Fix list
The changes that would bring RPKI, the IRR and what's announced into line. Some are deliberate (a route object kept for a backup route, say); the network decides. All 47 are in fix.csv.
- ROA: none16
- Route object: none2
- Route object: not announced29
| Change | Prefix or set | Detail |
|---|---|---|
| ROA: none | 137.213.239.0/24 | No ROA covers it. Add a ROA for AS13205, maxLength 24. |
| Route object: none | 137.213.239.0/24 | No route object for it. Add a route object with origin AS13205 in the RIR database for the space. |
| ROA: none | 137.213.252.0/23 | No ROA covers it. Add a ROA for AS13205, maxLength 23. |
| Route object: none | 137.213.252.0/23 | No route object for it. Add a route object with origin AS13205 in the RIR database for the space. |
| ROA: none | 31.11.56.0/23 | No ROA covers it. Add a ROA for AS13205, maxLength 23. |
| ROA: none | 78.109.0.0/20 | No ROA covers it. Add a ROA for AS13205, maxLength 20. |
| ROA: none | 78.109.0.0/24 | No ROA covers it. Add a ROA for AS13205, maxLength 24. |
| ROA: none | 78.109.5.0/24 | No ROA covers it. Add a ROA for AS13205, maxLength 24. |
| ROA: none | 78.109.6.0/24 | No ROA covers it. Add a ROA for AS13205, maxLength 24. |
| ROA: none | 78.109.7.0/24 | No ROA covers it. Add a ROA for AS13205, maxLength 24. |
| ROA: none | 78.109.9.0/24 | No ROA covers it. Add a ROA for AS13205, maxLength 24. |
| ROA: none | 78.109.10.0/24 | No ROA covers it. Add a ROA for AS13205, maxLength 24. |
| ROA: none | 78.109.11.0/24 | No ROA covers it. Add a ROA for AS13205, maxLength 24. |
| ROA: none | 217.140.0.0/20 | No ROA covers it. Add a ROA for AS13205, maxLength 20. |
| ROA: none | 217.140.12.0/22 | No ROA covers it. Add a ROA for AS13205, maxLength 22. |
| ROA: none | 217.140.12.0/24 | No ROA covers it. Add a ROA for AS13205, maxLength 24. |
| ROA: none | 217.140.13.0/24 | No ROA covers it. Add a ROA for AS13205, maxLength 24. |
| ROA: none | 217.140.32.0/19 | No ROA covers it. Add a ROA for AS13205, maxLength 19. |
Route objects not announced
Route objects with origin AS13205 whose prefix no peer sees AS13205 announce. Many are kept on purpose (backup routes, space announced only in some places).
| 31.11.58.0/24 | RIPE | No ROA |
| 78.109.0.128/25 | RIPE | No ROA |
| 78.109.1.0/24 | RIPE | No ROA |
| 78.109.2.0/24 | RIPE | No ROA |
| 78.109.3.0/24 | RIPE | No ROA |
| 78.109.4.0/24 | RIPE | No ROA |
| 78.109.5.64/26 | RIPE | No ROA |
| 78.109.8.0/24 | RIPE | No ROA |
| 78.109.12.0/24 | RIPE | No ROA |
| 78.109.13.0/24 | RIPE | No ROA |
| 78.109.14.0/24 | RIPE | No ROA |
| 78.109.15.0/24 | RIPE | No ROA |
| 91.208.37.0/24 | RIPE | No ROA |
| 192.31.31.0/24 | RIPE | No ROA |
| 192.65.153.0/24 | RIPE | No ROA |
| 193.177.184.0/24 | RIPE | No ROA |
| 193.177.185.0/24 | RIPE | No ROA |
| 194.26.68.0/24 | RIPE | No ROA |
| 194.107.114.0/24 | RIPE | No ROA |
| 217.140.0.0/21 | RIPE | No ROA |
| 217.140.7.0/24 | RIPE | No ROA |
| 217.140.8.0/23 | RIPE | No ROA |
| 217.140.10.0/24 | RIPE | No ROA |
| 217.140.11.0/24 | RIPE | No ROA |
| 217.140.14.0/24 | RIPE | No ROA |
| 217.140.15.0/24 | RIPE | No ROA |
| 217.140.16.0/20 | RIPE | No ROA |
| 217.140.24.0/23 | RIPE | No ROA |
| 217.140.56.0/23 | RIPE | No ROA |
Routes: the 08:00 UTC snapshots of 2026-11-12 from 75 RIPE RIS and RouteViews collectors. RPKI: our rpki-client run before the snapshot. IRR: the day's dumps of the five RIR databases and RADB's mirrors. The LEVEL3 and IDNIC databases publish no dump and aren't read, so route objects only there count as none.