These entries are queried from radb.net using whois, you can try my project getting these.
:AS26421 route: 23.29.0.0/20 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130627 #16:49:32Z source: RADB last-modified: 2023-11-13T15:45:26Z rpki-ov-state: valid route: 23.29.0.0/20 origin: AS26421 descr: Ponderosa Internet 23.29.0.0/20 route admin-c: NOC2106-ARIN tech-c: NOC2106-ARIN mnt-by: MNT-PONDE-1 created: 2022-10-12T21:24:41Z last-modified: 2023-02-27T21:11:29Z source: ARIN rpki-ov-state: valid route: 50.58.142.0/23 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130627 #16:55:11Z source: RADB last-modified: 2023-11-13T15:45:26Z rpki-ov-state: valid route: 64.129.228.0/24 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130627 #16:57:13Z source: RADB last-modified: 2023-11-13T15:45:26Z rpki-ov-state: valid route: 74.202.200.0/23 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130627 #16:59:42Z source: RADB last-modified: 2023-11-13T15:45:26Z rpki-ov-state: valid route: 206.169.217.0/24 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130627 #17:01:39Z source: RADB last-modified: 2023-11-13T15:45:26Z rpki-ov-state: valid route: 206.169.218.0/23 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130627 #17:03:33Z source: RADB last-modified: 2023-11-13T15:45:26Z rpki-ov-state: valid route: 207.114.159.0/24 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130627 #17:05:47Z source: RADB last-modified: 2023-11-13T15:45:26Z rpki-ov-state: valid route: 209.150.76.0/23 origin: AS26421 mnt-by: MAINT-AS54048 changed: cdeister [at] cvin.com 20240319 # 1514Z source: RADB last-modified: 2024-03-19T15:14:45Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 209.150.76.0/24 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130726 #17:01:58Z source: RADB last-modified: 2023-11-13T15:45:33Z rpki-ov-state: valid route: 209.150.77.0/24 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130726 #17:05:52Z source: RADB last-modified: 2023-11-13T15:45:33Z rpki-ov-state: valid route: 209.234.196.0/24 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130627 #17:11:19Z source: RADB last-modified: 2023-11-13T15:45:26Z rpki-ov-state: valid route: 209.234.206.0/24 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130726 #17:03:06Z source: RADB last-modified: 2023-11-13T15:45:33Z rpki-ov-state: valid route: 209.234.207.0/24 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130726 #17:07:18Z source: RADB last-modified: 2023-11-13T15:45:33Z rpki-ov-state: valid route: 209.234.208.0/23 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130627 #17:15:17Z source: RADB last-modified: 2023-11-13T15:45:26Z rpki-ov-state: valid route: 209.234.216.0/23 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130627 #17:17:02Z source: RADB last-modified: 2023-11-13T15:45:26Z rpki-ov-state: valid route: 209.234.222.0/24 descr: Ponderosa Cablevision California, USA origin: AS26421 mnt-by: MAINT-AS26421 changed: noc [at] netptc.net 20130627 #17:19:18Z source: RADB last-modified: 2023-11-13T15:45:26Z rpki-ov-state: valid