These entries are queried from radb.net using whois, you can try my project getting these.
:AS24297 route: 157.16.0.0/16 descr: Osaka Prefecture University origin: AS24297 mnt-by: MAINT-AS2907 changed: as2907 [at] sinet.ad.jp 20240301 source: JPIRR rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 157.16.0.0/16 descr: Osaka Prefecture University origin: AS24297 notify: noc [at] noc.kddnet.ad.jp mnt-by: MAINT-AS2516 changed: noc [at] noc.kddnet.ad.jp 20070919 source: RADB last-modified: 2023-11-13T15:39:53Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 163.226.0.0/16 descr: Osaka Prefecture University origin: AS24297 mnt-by: MAINT-AS2907 changed: as2907 [at] sinet.ad.jp 20240301 source: JPIRR rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 163.226.0.0/16 descr: Osaka Prefecture University origin: AS24297 notify: noc [at] noc.kddnet.ad.jp mnt-by: MAINT-AS2516 changed: noc [at] noc.kddnet.ad.jp 20070919 source: RADB last-modified: 2023-11-13T15:39:53Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source