These entries are queried from radb.net using whois, you can try my project getting these.
:AS45984 route: 203.253.227.0/24 descr: ASIA CANCER CENTER origin: AS45984 mnt-by: MAINT-AS4766 changed: nw [at] kornet.net 20100309 #01:49:49Z 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: 203.253.228.0/23 descr: ASIA CANCER CENTER origin: AS45984 mnt-by: MAINT-AS4766 changed: nw [at] kornet.net 20100309 #01:51:58Z 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: 203.253.228.0/24 descr: SejongTelecom.co.ltd origin: AS45984 mnt-by: MAINT-AS4670 changed: network [at] sejongtelecom.net 20201223 source: RADB last-modified: 2023-11-13T16:03:09Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.253.229.0/24 descr: SejongTelecom.co.ltd origin: AS45984 mnt-by: MAINT-AS4670 changed: network [at] sejongtelecom.net 20201223 source: RADB last-modified: 2023-11-13T16:03:09Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source