These entries are queried from radb.net using whois, you can try my project getting these.
:AS38892 route: 203.19.2.0/24 descr: Sydney Airport Corporation origin: AS38892 notify: routemaster [at] uecomm.net.au mnt-by: MAINT-AS10223 changed: bgpadmin [at] uecomm.com.au 20081023 source: RADB last-modified: 2023-11-13T15:41:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source