These entries are queried from radb.net using whois, you can try my project getting these.
:AS7252 route: 67.137.52.0/24 descr: Route Object for NWNetcom customer AS32359 origin: AS7252 mnt-by: NWNETCOM-MNT changed: Mike.Flanagan [at] Level3.com 20041119 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 199.195.243.0/24 descr: LIGHTOWER-CSR-MCGRAW COMMUNICATIONS origin: AS7252 mnt-by: MAINT-AS27506 changed: dataoperations [at] sidera.net 20130520 #18:13:13Z source: RADB last-modified: 2023-11-13T15:45:25Z rpki-ov-state: valid route: 206.190.128.0/19 descr: Route for NWNetcom AS7252 origin: AS7252 mnt-by: NWNETCOM-MNT changed: Mike.Flanagan [at] Level3.com 20041119 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 209.63.27.0/24 descr: Route Object for NWNetcom customer AS33580 origin: AS7252 mnt-by: NWNETCOM-MNT changed: jerel.harwood [at] nwnetcom.com 20050323 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 209.95.32.0/19 descr: Route Object for NWNetcom AS-Set origin: AS7252 mnt-by: NWNETCOM-MNT changed: Mike.Flanagan [at] Level3.com 20041119 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source