These entries are queried from radb.net using whois, you can try my project getting these.
:AS398902 route: 208.52.165.0/24 origin: AS398902 descr: Cass Regional Medical Center admin-c: WESEM3-ARIN tech-c: WESEM3-ARIN mnt-by: MNT-CRMC-28 created: 2020-12-02T19:21:53Z last-modified: 2020-12-02T19:21:53Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source