These entries are queried from radb.net using whois, you can try my project getting these.
:AS28556 route: 187.252.9.0/24 descr: Customer Bestel origin: AS28556 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: 187.252.248.0/22 descr: Customer Bestel origin: AS28556 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: 187.252.248.0/23 descr: Customer Bestel origin: AS28556 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: 187.252.250.0/23 descr: Customer Bestel origin: AS28556 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