These entries are queried from radb.net using whois, you can try my project getting these.
:AS11257 route: 142.66.0.0/16 descr: University of Lethbridge (NET-ULETH) origin: AS11257 mnt-by: CYBERA-AB-MNT changed: unread [at] ripe.net 20000101 source: CANARIE rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 142.66.0.0/16 descr: NET-142-66-0-0-1 origin: AS11257 remarks: Proxy route on behalf of University of Lethbridge mnt-by: MAINT-AS852 notify: backbone [at] telus.com changed: abuse [at] telus.com 20190902 source: RADB last-modified: 2023-11-13T15:57:08Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 142.66.0.0/18 descr: University of Lethbridge (NET-ULETH) origin: AS11257 mnt-by: CYBERA-AB-MNT changed: unread [at] ripe.net 20000101 source: CANARIE rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 142.66.64.0/18 descr: University of Lethbridge (NET-ULETH) origin: AS11257 mnt-by: CYBERA-AB-MNT changed: unread [at] ripe.net 20000101 source: CANARIE rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source