These entries are queried from radb.net using whois, you can try my project getting these.
:AS18142 route: 210.141.176.0/20 descr: BIWANET origin: AS18142 notify: dc_support [at] kistem.co.jp mnt-by: MAINT-AS18142 changed: k-sugimoto [at] kistem.co.jp 20160826 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.141.176.0/24 descr: BIWANET origin: AS18142 notify: dc_support [at] kistem.co.jp mnt-by: MAINT-AS18142 changed: k-sugimoto [at] kistem.co.jp 20160826 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.141.177.0/24 descr: BIWANET origin: AS18142 notify: dc_support [at] kistem.co.jp mnt-by: MAINT-AS18142 changed: k-sugimoto [at] kistem.co.jp 20160826 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.141.178.0/24 descr: BIWANET origin: AS18142 notify: dc_support [at] kistem.co.jp mnt-by: MAINT-AS18142 changed: k-sugimoto [at] kistem.co.jp 20160826 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.173.32.0/19 descr: BIWANET origin: AS18142 notify: dc_support [at] kistem.co.jp mnt-by: MAINT-AS18142 changed: k-sugimoto [at] kistem.co.jp 20160826 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.173.32.0/24 descr: BIWANET origin: AS18142 notify: dc_support [at] kistem.co.jp mnt-by: MAINT-AS18142 changed: k-sugimoto [at] kistem.co.jp 20160826 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.173.33.0/24 descr: BIWANET origin: AS18142 notify: dc_support [at] kistem.co.jp mnt-by: MAINT-AS18142 changed: k-sugimoto [at] kistem.co.jp 20160826 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.173.34.0/24 descr: BIWANET origin: AS18142 notify: dc_support [at] kistem.co.jp mnt-by: MAINT-AS18142 changed: k-sugimoto [at] kistem.co.jp 20160826 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.173.36.0/24 descr: BIWANET origin: AS18142 notify: dc_support [at] kistem.co.jp mnt-by: MAINT-AS18142 changed: k-sugimoto [at] kistem.co.jp 20160826 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.173.37.0/24 descr: BIWANET origin: AS18142 notify: dc_support [at] kistem.co.jp mnt-by: MAINT-AS18142 changed: k-sugimoto [at] kistem.co.jp 20160826 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.173.38.0/24 descr: BIWANET origin: AS18142 notify: dc_support [at] kistem.co.jp mnt-by: MAINT-AS18142 changed: k-sugimoto [at] kistem.co.jp 20160826 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.173.39.0/24 descr: BIWANET origin: AS18142 notify: dc_support [at] kistem.co.jp mnt-by: MAINT-AS18142 changed: k-sugimoto [at] kistem.co.jp 20160826 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.173.40.0/24 descr: BIWANET origin: AS18142 notify: dc_support [at] kistem.co.jp mnt-by: MAINT-AS18142 changed: k-sugimoto [at] kistem.co.jp 20171127 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.173.41.0/24 descr: BIWANET origin: AS18142 notify: dc_support [at] kistem.co.jp mnt-by: MAINT-AS18142 changed: k-sugimoto [at] kistem.co.jp 20180213 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source