These entries are queried from radb.net using whois, you can try my project getting these.
:AS9760 route: 147.6.0.0/16 descr: KORnet operation Center origin: AS9760 mnt-by: MAINT-AS4766 changed: shing [at] soback.kornet.nm.kr 19991220 changed: eyeface7777 [at] kornet.net 20040825 #05:22:14(UTC) 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: 168.248.0.0/15 descr: Korea Telecom Infomation System Group 924 Mok-dong Yangcheon-gu Seoul origin: AS9760 mnt-by: MAINT-AS4766 changed: choi [at] streamwk.kix.net 20010212 source: RADB last-modified: 2023-11-13T16:15:42Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source