These entries are queried from radb.net using whois, you can try my project getting these.
:AS61751 route: 131.72.252.0/22 descr: SintNet origin: AS61751 mnt-by: MAINT-AS263047 changed: eng [at] linkfull.com.br 20151116 #12:42:57Z source: RADB last-modified: 2023-11-13T15:58:51Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 131.72.252.0/22 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:36:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 131.72.252.0/23 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:36:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 131.72.252.0/23 descr: CLARO S.A. Customer origin: AS61751 remarks: Proxy Object notify: irradmin [at] embratel.net.br mnt-by: MAINT-AS4230 changed: irradmin [at] embratel.net.br 20210226 source: RADB last-modified: 2023-11-13T16:03:40Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 131.72.252.0/24 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:36:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 131.72.253.0/24 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:36:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 131.72.254.0/23 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:36:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 131.72.254.0/23 descr: CLARO S.A. Customer origin: AS61751 remarks: Proxy Object notify: irradmin [at] embratel.net.br mnt-by: MAINT-AS4230 changed: irradmin [at] embratel.net.br 20210226 source: RADB last-modified: 2023-11-13T16:03:40Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 131.72.254.0/24 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:36:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 131.72.255.0/24 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:36:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 168.228.40.0/22 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:36:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 168.228.40.0/22 descr: ITX-K2TELECOM origin: AS61751 mnt-by: MAINT-AS18678 changed: adminred [at] internexa.com 20160726 #14:05:05Z source: RADB last-modified: 2023-11-13T15:49:36Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 168.228.40.0/23 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:36:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 168.228.40.0/23 descr: CLARO S.A. Customer origin: AS61751 remarks: Proxy Object notify: irradmin [at] embratel.net.br mnt-by: MAINT-AS4230 changed: irradmin [at] embratel.net.br 20210312 source: RADB last-modified: 2023-11-13T16:05:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 168.228.40.0/24 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:36:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 168.228.41.0/24 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:36:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 168.228.42.0/23 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:36:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 168.228.42.0/23 descr: CLARO S.A. Customer origin: AS61751 remarks: Proxy Object notify: irradmin [at] embratel.net.br mnt-by: MAINT-AS4230 changed: irradmin [at] embratel.net.br 20210312 source: RADB last-modified: 2023-11-13T16:05:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 168.228.42.0/24 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:36:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 168.228.43.0/24 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:36:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2804:1bcc::/32 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:50:40Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2804:1bcc::/32 descr: SintNetv6 origin: AS61751 mnt-by: MAINT-AS263047 changed: eng [at] linkfull.com.br 20151116 #12:45:16Z source: RADB last-modified: 2023-11-13T15:58:51Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2804:1bcc::/33 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:50:40Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2804:1bcc:8000::/33 descr: SINTNET-TELECOMUNICACOES E INFORMATICA LTDA origin: AS61751 mnt-by: MAINT-AS61751 notify: engenharia [at] sintnet.com.br changed: engenharia [at] sintnet.com.br 20210514 source: TC last-modified: 2021-05-14T18:50:40Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source