These entries are queried from radb.net using whois, you can try my project getting these.
:AS38087 route: 61.254.128.0/24 descr: proxy for HANARO TELECOM route origin: AS38087 mnt-by: MAINT-HANARO changed: ce-support [at] us.ntt.net 20080904 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 219.252.192.0/24 descr: proxy for HANARO TELECOM route origin: AS38087 mnt-by: MAINT-HANARO changed: ce-support [at] us.ntt.net 20080504 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 219.252.193.0/24 descr: proxy for HANARO TELECOM route origin: AS38087 mnt-by: MAINT-HANARO changed: ce-support [at] us.ntt.net 20080504 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 219.252.197.0/24 descr: proxy for HANARO TELECOM route origin: AS38087 mnt-by: MAINT-HANARO changed: ce-support [at] us.ntt.net 20080504 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 219.252.200.0/24 descr: proxy for HANARO TELECOM route origin: AS38087 mnt-by: MAINT-HANARO changed: ce-support [at] us.ntt.net 20080504 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source