These entries are queried from radb.net using whois, you can try my project getting these.
:AS62552 route: 206.220.76.0/22 descr: RR-RC-San Marino Unified School District-Los Angeles origin: AS62552 notify: publicipaddressing [at] charter.com mnt-by: MAINT-RR changed: publicipaddressing [at] charter.com 20181017 #22:02:30Z source: RADB last-modified: 2023-11-13T16:15:17Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source