These entries are queried from radb.net using whois, you can try my project getting these.
:AS13919 route: 67.99.32.0/24 descr: route update via web origin: AS13919 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 route: 205.144.48.0/20 descr: route update via web origin: AS13919 mnt-by: LEVEL3-MNT changed: taras.tomkiv [at] level3.com 20170517 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 205.144.50.0/23 descr: route update via web origin: AS13919 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 route: 205.144.52.0/23 descr: route update via web origin: AS13919 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