These entries are queried from radb.net using whois, you can try my project getting these.
:AS16407 route: 38.105.140.0/24 descr: Linden Advisors origin: AS16407 mnt-by: MAINT-AS27506 changed: rdavis [at] lightower.com 20141212 source: RADB last-modified: 2023-11-13T15:47:01Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source