These entries are queried from radb.net using whois, you can try my project getting these.
:AS395742 route: 12.236.4.0/24 descr: 12.236.4.0/24 - proxy-registered for The Brookfield Group origin: AS395742 mnt-by: MNT-ATTW-Z changed: jayb [at] att.com 20200421 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source