These entries are queried from radb.net using whois, you can try my project getting these.
:AS63254 route: 204.76.144.0/21 descr: County of Nassau origin: AS63254 mnt-by: MAINT-AS27506 changed: yikehara [at] lightower.com 20151027 source: RADB last-modified: 2023-11-13T15:48:25Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source