These entries are queried from radb.net using whois, you can try my project getting these.
:AS13691 route: 192.188.99.0/24 descr: MetroCC origin: AS13691 mnt-by: MAINT-AS11714 changed: network [at] nebraska.edu 20180810 #18:35:15Z source: RADB last-modified: 2023-11-13T15:54:25Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 199.184.232.0/22 descr: Metro Community College origin: AS13691 mnt-by: MAINT-AS11714 changed: network [at] nebraska.edu 20121212 #20:45:44Z source: RADB last-modified: 2023-11-13T15:44:29Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source