These entries are queried from radb.net using whois, you can try my project getting these.
:AS64237 route: 207.90.185.0/24 descr: MASSACHUSETTS CONVENTION CENTER AUTHORITY origin: AS64237 mnt-by: MAINT-AS27506 changed: mdimambro [at] lightower.com 20190510 source: RADB last-modified: 2023-11-13T15:56:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source