These entries are queried from radb.net using whois, you can try my project getting these.
:AS35857 route: 142.99.246.0/23 descr: SIAST (NET-142-99-0-0-1) origin: AS35857 member-of: AS26806:RS-GigaPoP mnt-by: SRNET-SK-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: 142.99.246.0/23 origin: AS35857 descr: Proxy route for customer - Saskatchewan Polytechnic mnt-by: MAINT-AS19523 changed: jay.mcmaster [at] bhtelecom.ca 20221208 #22:49:19Z source: RADB last-modified: 2023-11-13T16:13:12Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 142.99.246.0/24 descr: SIAST (NET-142-99-0-0-1) origin: AS35857 member-of: AS26806:RS-GigaPoP mnt-by: SRNET-SK-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: 142.99.247.0/24 descr: SIAST (NET-142-99-0-0-1) origin: AS35857 member-of: AS26806:RS-GigaPoP mnt-by: SRNET-SK-MNT notify: support [at] srnet.ca changed: unread [at] ripe.net 20000101 source: CANARIE rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 198.169.238.0/24 descr: Proxy Addition remarks: Added by Shaw on behalf of customer origin: AS35857 notify: ipadmin-sbs [at] sjrb.ca mnt-by: MAINT-AS6327 changed: ipadmin-sbs [at] sjrb.ca 20201208 source: RADB last-modified: 2024-03-05T21:00:09Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source