These entries are queried from radb.net using whois, you can try my project getting these.
:AS266144 route6: 2804:3b5c::/32 descr: PROXY FOR OPENX CUSTOMER origin: AS266144 mnt-by: MAINT-AS263444 notify: registro [at] openx.com.br changed: registro [at] openx.com.br 20210518 remarks: Tue May 18 14:20:37 2021 source: RADB last-modified: 2023-11-13T16:05:44Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source