Network · data from 2026-11-12
AS21301 UK-NATWEST-AS21301 Natwest Markets PLC
Registry name: UK-NATWEST-AS21301 Natwest Markets PLC, GB · not in PeeringDB
Announced routes
Every prefix a peer of the route collectors sees with origin AS21301, 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.
| 155.136.56.0/24 | No ROA | Other IRR onlyRADB | 672 100% |
| 155.136.57.0/24 | No ROA | Other IRR onlyRADB | 672 100% |
| 155.136.58.0/24 | No ROA | Other IRR onlyRADB | 672 100% |
| 155.136.59.0/24 | No ROA | Other IRR onlyRADB | 672 100% |
| 155.136.200.0/24 | No ROA | Other IRR onlyRADB | 672 100% |
| 155.136.201.0/24 | No ROA | Other IRR onlyRADB | 672 100% |
| 155.136.56.0/22 | No ROA | RIR databaseRIPE | 672 100% |
| 155.136.151.0/24 | No ROA | RIR databaseRADB, RIPE | 672 100% |
| 155.136.144.0/24 | No ROA | RIR databaseRADB, RIPE | 655 97% |
| 155.136.146.0/24 | No ROA | RIR databaseRADB, RIPE | 655 97% |
| 155.136.202.0/23 | No ROA | RIR databaseRIPE | 406 60% |
| 155.136.0.0/16 | No ROA | RIR databaseRADB, RIPE | 397 59% |
| 155.136.200.0/23 | No ROA | RIR databaseRADB, RIPE | 382 57% |
AS-SET
AS21301 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 37 are in fix.csv.
- ROA: none13
- Route object: RIR6
- Route object: not announced18
| Change | Prefix or set | Detail |
|---|---|---|
| ROA: none | 155.136.56.0/24 | No ROA covers it. Add a ROA for AS21301, maxLength 24. |
| Route object: RIR | 155.136.56.0/24 | Route object only in RADB. Add it in the RIR database for the space. |
| ROA: none | 155.136.57.0/24 | No ROA covers it. Add a ROA for AS21301, maxLength 24. |
| Route object: RIR | 155.136.57.0/24 | Route object only in RADB. Add it in the RIR database for the space. |
| ROA: none | 155.136.58.0/24 | No ROA covers it. Add a ROA for AS21301, maxLength 24. |
| Route object: RIR | 155.136.58.0/24 | Route object only in RADB. Add it in the RIR database for the space. |
| ROA: none | 155.136.59.0/24 | No ROA covers it. Add a ROA for AS21301, maxLength 24. |
| Route object: RIR | 155.136.59.0/24 | Route object only in RADB. Add it in the RIR database for the space. |
| ROA: none | 155.136.200.0/24 | No ROA covers it. Add a ROA for AS21301, maxLength 24. |
| Route object: RIR | 155.136.200.0/24 | Route object only in RADB. Add it in the RIR database for the space. |
| ROA: none | 155.136.201.0/24 | No ROA covers it. Add a ROA for AS21301, maxLength 24. |
| Route object: RIR | 155.136.201.0/24 | Route object only in RADB. Add it in the RIR database for the space. |
| ROA: none | 155.136.56.0/22 | No ROA covers it. Add a ROA for AS21301, maxLength 22. |
| ROA: none | 155.136.151.0/24 | No ROA covers it. Add a ROA for AS21301, maxLength 24. |
| ROA: none | 155.136.144.0/24 | No ROA covers it. Add a ROA for AS21301, maxLength 24. |
| ROA: none | 155.136.146.0/24 | No ROA covers it. Add a ROA for AS21301, maxLength 24. |
| ROA: none | 155.136.202.0/23 | No ROA covers it. Add a ROA for AS21301, maxLength 23. |
| ROA: none | 155.136.0.0/16 | No ROA covers it. Add a ROA for AS21301, maxLength 16. |
| ROA: none | 155.136.200.0/23 | No ROA covers it. Add a ROA for AS21301, maxLength 23. |
Route objects not announced
Route objects with origin AS21301 whose prefix no peer sees AS21301 announce. Many are kept on purpose (backup routes, space announced only in some places).
| 147.114.224.0/22 | RIPE-NONAUTH | No ROA |
| 147.114.224.0/24 | RIPE-NONAUTH | No ROA |
| 147.114.225.0/24 | RIPE-NONAUTH | No ROA |
| 147.114.226.0/24 | RIPE-NONAUTH | No ROA |
| 147.114.227.0/24 | RIPE-NONAUTH | No ROA |
| 155.136.12.0/24 | RIPE | No ROA |
| 155.136.13.0/24 | RIPE | No ROA |
| 155.136.60.0/22 | RIPE | No ROA |
| 155.136.60.0/24 | RADB | No ROA |
| 155.136.61.0/24 | RADB | No ROA |
| 155.136.62.0/24 | RADB | No ROA |
| 155.136.63.0/24 | RADB | No ROA |
| 155.136.87.0/24 | RIPE | No ROA |
| 155.136.152.0/22 | RIPE | No ROA |
| 155.136.184.0/24 | RIPE | No ROA |
| 155.136.197.0/24 | RADB, RIPE | No ROA |
| 155.136.202.0/24 | RADB | No ROA |
| 155.136.203.0/24 | RADB | 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.