These entries are queried from radb.net using whois, you can try my project getting these.
:AS54616 route: 173.244.0.0/19 descr: Salem State University origin: AS54616 mnt-by: MAINT-AS27506 changed: probillard [at] lightower.com 20170314 source: RADB last-modified: 2023-11-13T15:50:53Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source