These entries are queried from radb.net using whois, you can try my project getting these.
:AS21520 route: 148.205.0.0/16 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.36.0/22 origin: AS21520 descr: Instituto Tecnologico Autonomo de Mexico(ITAM) mnt-by: MAINT-AS18734 changed: mfarrevillaga [at] izzi.mx 20230809 source: RADB last-modified: 2023-11-13T16:18:11Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.40.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.48.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.64.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.68.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.72.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.84.0/24 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.104.0/22 descr: Forced Object Correction origin: AS21520 mnt-by: MAINT-AS7132 changed: peering [at] intl.att.com 20190903 source: RADB last-modified: 2023-11-13T15:57:09Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.112.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.120.0/24 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.124.0/22 descr: Proxy-registered route object origin: AS21520 remarks: This route object is for a BtN customer route remarks: which is being exported under this origin AS. remarks: remarks: This route object was created because no existing remarks: route object with the same origin was found, and remarks: since some BtN peers filter based on these objects remarks: this route may be rejected if this object is not created. remarks: remarks: Please contact peering [at] cais.net if you have any remarks: questions regarding this object. mnt-by: MAINT-AS3491 changed: sajwani [at] pccwbtn.com 20081223 source: RADB last-modified: 2023-11-13T15:42:39Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.132.0/22 origin: AS21520 descr: Instituto Tecnologico Autonomo de Mexico(ITAM) mnt-by: MAINT-AS18734 changed: mfarrevillaga [at] izzi.mx 20230809 source: RADB last-modified: 2023-11-13T16:18:11Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.136.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.148.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.152.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.164.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.176.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.191.0/24 origin: AS21520 descr: Instituto Tecnologico Autonomo de Mexico(ITAM) mnt-by: MAINT-AS18734 changed: mfarrevillaga [at] izzi.mx 20230809 source: RADB last-modified: 2023-11-13T16:18:11Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.193.0/24 origin: AS21520 descr: Instituto Tecnologico Autonomo de Mexico(ITAM) mnt-by: MAINT-AS18734 changed: mfarrevillaga [at] izzi.mx 20230809 source: RADB last-modified: 2023-11-13T16:18:11Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.196.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.208.0/22 descr: Forced Object Correction origin: AS21520 mnt-by: MAINT-AS7132 changed: peering [at] intl.att.com 20190903 source: RADB last-modified: 2023-11-13T15:57:09Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.208.0/24 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.228.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.232.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 148.205.236.0/22 descr: Customer Bestel origin: AS21520 mnt-by: MAINT-AS32098 changed: mmg [at] transtelco.net 20170808 source: RADB last-modified: 2023-11-13T15:51:18Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source