These entries are queried from radb.net using whois, you can try my project getting these.
:AS55587 route: 49.50.16.0/21 descr: proxy for HANARO TELECOM route origin: AS55587 mnt-by: MAINT-HANARO changed: ce-support [at] us.ntt.net 20101112 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 49.50.24.0/21 descr: proxy for HANARO TELECOM route origin: AS55587 mnt-by: MAINT-HANARO changed: ce-support [at] us.ntt.net 20101112 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 211.238.56.0/24 origin: AS55587 descr: AS55587 mnt-by: MAINT-AS4766 changed: ipnoc [at] kt.com 20191028 #08:37:21Z source: RADB last-modified: 2023-11-13T16:15:44Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 211.238.57.0/24 origin: AS55587 descr: AS55587 mnt-by: MAINT-AS4766 changed: ipnoc [at] kt.com 20191028 #08:38:13Z source: RADB last-modified: 2023-11-13T16:15:44Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source