These entries are queried from radb.net using whois, you can try my project getting these.
:AS38663 route: 121.162.155.0/24 descr: National Information & Credit Evaluation origin: AS38663 mnt-by: MAINT-AS4766 changed: ipnoc [at] kt.com 20150212 #04:10:15Z source: RADB last-modified: 2023-11-13T16:15:58Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 183.96.231.0/24 descr: proxy for HANARO TELECOM route origin: AS38663 mnt-by: MAINT-HANARO changed: ce-support [at] us.ntt.net 20100814 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 183.96.231.0/24 descr: korea credit information origin: AS38663 mnt-by: MAINT-AS9318 changed: noc [at] skbroadband.com 20130129 #06:38:26Z source: RADB last-modified: 2023-11-13T15:44:52Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.234.218.0/24 descr: korea credit information origin: AS38663 mnt-by: MAINT-AS9318 changed: noc [at] skbroadband.com 20130129 #06:39:03Z source: RADB last-modified: 2023-11-13T15:44:52Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.234.218.0/24 descr: proxy for HANARO TELECOM route origin: AS38663 mnt-by: MAINT-HANARO changed: ce-support [at] us.ntt.net 20080504 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.234.219.0/24 descr: proxy for HANARO TELECOM route origin: AS38663 mnt-by: MAINT-HANARO changed: ce-support [at] us.ntt.net 20080504 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.234.219.0/24 descr: korea credit information origin: AS38663 mnt-by: MAINT-AS9318 changed: noc [at] skbroadband.com 20130129 #06:39:34Z source: RADB last-modified: 2023-11-13T15:44:52Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source