These entries are queried from radb.net using whois, you can try my project getting these.
:AS53515 route: 204.27.231.0/24 descr: Amtelco origin: AS53515 mnt-by: MAINT-CHTR-WD changed: wendel.herron [at] chartercom.com 20100724 #08:45:44Z source: RADB last-modified: 2023-11-13T16:11:25Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source