These entries are queried from radb.net using whois, you can try my project getting these.
:AS393628 route: 216.3.21.0/24 descr: Controlco Customer Route origin: AS393628 mnt-by: LEVEL3-MNT changed: nathan.ruska [at] level3.com 20170703 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source