These entries are queried from radb.net using whois, you can try my project getting these.
:AS53575 route: 198.151.179.0/24 descr: Austin College routeA origin: AS53575 mnt-by: AC1-MNT changed: christine.russell [at] level3.com 20101116 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 198.151.180.0/22 descr: Austin College route origin: AS53575 mnt-by: AC1-MNT changed: christine.russell [at] level3.com 20101116 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source