These entries are queried from radb.net using whois, you can try my project getting these.
:AS263087 route: 177.137.208.0/20 descr: PROXY FOR OPENX CUSTOMER origin: AS263087 mnt-by: MAINT-AS263444 notify: registro [at] openx.com.br changed: registro [at] openx.com.br 20210518 remarks: Tue May 18 13:36:22 2021 source: RADB last-modified: 2023-11-13T16:05:44Z rpki-ov-state: valid route: 179.109.160.0/20 descr: CLARO S.A. Customer origin: AS263087 remarks: Proxy Object notify: irradmin [at] embratel.net.br mnt-by: MAINT-AS4230 changed: irradmin [at] embratel.net.br 20210513 source: RADB last-modified: 2023-11-13T16:05:44Z rpki-ov-state: valid route6: 2804:978::/32 descr: PROXY FOR OPENX CUSTOMER origin: AS263087 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: valid