These entries are queried from radb.net using whois, you can try my project getting these.
:AS45963 route: 203.247.182.0/24 descr: Korea Institute of Radiological & Medical Sciences origin: AS45963 mnt-by: MAINT-AS4766 changed: nw [at] kornet.net 20100121 source: RADB last-modified: 2023-11-13T16:15:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source