These entries are queried from radb.net using whois, you can try my project getting these.
:AS2640 route: 147.155.0.0/16 descr: Ames Laboratory Iowa State University TASF Building IA 50011-3020, USA origin: AS2640 mnt-by: MAINT-ESNET changed: yhines [at] es.net 20010326 source: RADB last-modified: 2023-11-13T15:39:32Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 192.245.178.0/24 descr: AMESLAB-TIP Ames Laboratory 124C Wilhelm, Ames IA 50011, Ames IA 50011, USA origin: AS2640 mnt-by: MAINT-ESNET changed: yhines [at] es.net 20000131 source: RADB last-modified: 2023-11-13T15:39:32Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2620:57::/48 descr: Ames Laboratory Iowa State University TASF Building IA 50011-3020, USA origin: AS2640 mnt-by: MAINT-ESNET changed: hostmaster [at] es.net 20120510 #22:38:02Z source: RADB last-modified: 2023-11-13T15:42:41Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source