These entries are queried from radb.net using whois, you can try my project getting these.
:AS17576 route: 203.253.232.0/24 descr: contact ydryu [at] yahoo.com if necessary origin: AS17576 mnt-by: MAINT-AS3786 changed: ysjeon7 [at] bora.net 20010504 source: RADB last-modified: 2023-11-13T16:09:29Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 221.158.73.0/24 descr: KOREALIFE-AS-KR origin: AS17576 mnt-by: MAINT-AS3786 changed: yuncheol [at] bora.net 20030604 source: RADB last-modified: 2023-11-13T16:09:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source