These entries are queried from radb.net using whois, you can try my project getting these.
:AS3784 route: 141.223.0.0/18 descr: POSTECH Pohang KOREA origin: AS3784 mnt-by: MAINT-AS4766 changed: choi [at] streamwk.kix.net 20010206 source: RADB last-modified: 2023-11-13T16:15:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 141.223.64.0/18 descr: POSTECH Pohang KOREA origin: AS3784 mnt-by: MAINT-AS4766 changed: choi [at] streamwk.kix.net 20010206 source: RADB last-modified: 2023-11-13T16:15:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 141.223.128.0/18 descr: POSTECH Pohang KOREA origin: AS3784 mnt-by: MAINT-AS4766 changed: choi [at] streamwk.kix.net 20010206 source: RADB last-modified: 2023-11-13T16:15:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 141.223.192.0/18 descr: POSTECH Pohang KOREA origin: AS3784 mnt-by: MAINT-AS4766 changed: choi [at] streamwk.kix.net 20010206 source: RADB last-modified: 2023-11-13T16:15:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source