These entries are queried from radb.net using whois, you can try my project getting these.
:AS7661 route: 192.47.240.0/24 descr: SAINS origin: AS7661 notify: secretariat [at] north.ad.jp notify: noc-ad [at] north.ad.jp mnt-by: MAINT-AS7661 changed: kawai [at] north.ad.jp 20050411 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 192.51.250.0/24 descr: NORTH-INET origin: AS7661 notify: secretariat [at] north.ad.jp notify: noc-ad [at] north.ad.jp mnt-by: MAINT-AS7661 changed: kawai [at] north.ad.jp 20050411 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source