These entries are queried from radb.net using whois, you can try my project getting these.
:AS18476 route: 71.4.208.0/24 descr: route update via web origin: AS18476 mnt-by: LEVEL3-MNT changed: Christiano.solis [at] level3.com 20080414 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source