These entries are queried from radb.net using whois, you can try my project getting these.
:AS19408 route: 198.90.73.0/24 descr: Western Dental origin: AS19408 mnt-by: MAINT-AS5693 changed: neteng [at] latisys.com 20150610 #15:26:51Z source: RADB last-modified: 2023-11-13T15:47:42Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source