These entries are queried from radb.net using whois, you can try my project getting these.
:AS18800 route: 144.35.0.0/16 origin: AS18800 descr: This is a SLCC owned prefix announced by UEN mnt-by: MAINT-AS210 changed: jesse [at] uen.org 20200402 #22:28:56Z source: RADB last-modified: 2023-11-13T16:00:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source