These entries are queried from radb.net using whois, you can try my project getting these.
:AS393549 route: 192.75.255.0/24 descr: The Walsh Group origin: AS393549 mnt-by: MAINT-AS27506 changed: probillard [at] lightower.com 20180925 source: RADB last-modified: 2023-11-13T15:54:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source