These entries are queried from radb.net using whois, you can try my project getting these.
:AS52837 route: 177.66.4.0/24 descr: PROXY FOR OPENX CUSTOMER origin: AS52837 mnt-by: MAINT-AS263444 notify: registro [at] openx.com.br changed: registro [at] openx.com.br 20190820 remarks: Tue Aug 20 12:26:22 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: 2801:80:4e0::/48 descr: Cemig origin: AS52837 mnt-by: MAINT-AS18678 changed: adminred [at] internexa.com 20170203 #13:53:20Z source: RADB last-modified: 2023-11-13T15:50:36Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source