These entries are queried from radb.net using whois, you can try my project getting these.
:AS7621 route: 117.17.250.0/24 descr: Kyonggi University origin: AS7621 mnt-by: MAINT-AS4766 changed: lasas001 [at] kornet.net 20090402 source: RADB last-modified: 2023-11-13T16:15:42Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 117.17.251.0/24 descr: Kyonggi University origin: AS7621 mnt-by: MAINT-AS4766 changed: lasas001 [at] kornet.net 20090402 source: RADB last-modified: 2023-11-13T16:15:42Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 117.17.252.0/24 descr: Kyonggi University origin: AS7621 mnt-by: MAINT-AS4766 changed: lasas001 [at] kornet.net 20090402 source: RADB last-modified: 2023-11-13T16:15:42Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.249.0.0/19 descr: Kyonggi University origin: AS7621 mnt-by: MAINT-AS4766 changed: choi [at] streamwk.kix.net 20010206 source: RADB last-modified: 2023-11-13T16:15:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source