These entries are queried from radb.net using whois, you can try my project getting these.
:AS264286 route: 138.121.20.0/22 descr: PROXY FOR OPENX CUSTOMER origin: AS264286 mnt-by: MAINT-AS263444 notify: registro [at] openx.com.br changed: registro [at] openx.com.br 20190529 remarks: Wed May 29 17:38:46 2019 source: RADB last-modified: 2023-11-13T16:00:23Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2804:2588::/32 descr: PROXY FOR OPENX CUSTOMER origin: AS264286 mnt-by: MAINT-AS263444 notify: registro [at] openx.com.br changed: registro [at] openx.com.br 20190529 remarks: Wed May 29 17:41:27 2019 source: RADB last-modified: 2023-11-13T16:00:23Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source