These entries are queried from radb.net using whois, you can try my project getting these.
:AS30243 route: 216.182.144.0/20 descr: Saginaw City Schools origin: AS30243 mnt-by: MAINT-CHTR-WD changed: john.abeln [at] chartercom.com 20091028 source: RADB last-modified: 2023-11-13T16:11:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source