These entries are queried from radb.net using whois, you can try my project getting these.
:AS38674 route: 14.49.192.0/24 descr: as-name NLCSJEJU-AS-KR origin: AS38674 mnt-by: MAINT-AS9318 changed: noc [at] skbroadband.com 20170215 #13:15:38Z source: RADB last-modified: 2023-11-13T15:50:50Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 14.49.193.0/24 descr: as-name NLCSJEJU-AS-KR origin: AS38674 mnt-by: MAINT-AS9318 changed: noc [at] skbroadband.com 20170215 #13:15:38Z source: RADB last-modified: 2023-11-13T15:50:50Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 14.49.194.0/24 descr: as-name NLCSJEJU-AS-KR origin: AS38674 mnt-by: MAINT-AS9318 changed: noc [at] skbroadband.com 20170215 #13:15:38Z source: RADB last-modified: 2023-11-13T15:50:50Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 218.149.166.0/24 descr: NLCS Jeju origin: AS38674 mnt-by: MAINT-AS9318 changed: noc [at] skbroadband.com 20170215 #17:00:31Z source: RADB last-modified: 2023-11-13T15:50:50Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source