These entries are queried from radb.net using whois, you can try my project getting these.
:AS40743 route: 12.52.38.0/24 descr: RR-RC-California Joint Powers Insurance Authority-La Palma origin: AS40743 notify: publicipaddressing [at] charter.com mnt-by: MAINT-RR changed: publicipaddressing [at] charter.com 20181017 #22:02:30Z source: RADB last-modified: 2023-11-13T16:15:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source