These entries are queried from radb.net using whois, you can try my project getting these.
:AS53717 route6: 2606:f00::/32 descr: ICG Link, Inc. origin: AS53717 mnt-by: MAINT-AS53717 changed: peggy.knapp [at] level3.com 20111103 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source