These entries are queried from radb.net using whois, you can try my project getting these.
:AS7355 route: 137.203.0.0/16 descr: Mitsubishi IP Block origin: AS7355 remarks: MA-860716 mnt-by: CONV-MNT changed: bthelin [at] conversent.com 20070319 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 137.203.0.0/16 descr: Mitsubishi Electric Research Labs origin: AS7355 mnt-by: MAINT-AS27506 changed: yikehara [at] lightower.com 20150814 source: RADB last-modified: 2023-11-13T15:48:06Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source