These entries are queried from radb.net using whois, you can try my project getting these.
:AS16439 route: 198.212.199.0/24 descr: Amtrak origin: AS16439 mnt-by: MAINT-AS27506 changed: rdavis [at] lightower.com 20150506 source: RADB last-modified: 2023-11-13T15:47:25Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source