These entries are queried from radb.net using whois, you can try my project getting these.
:AS53213 route6: 2804:cb8::/32 descr: Angola Cables proxy-registered route object for customer AS53213 origin: AS53213 remarks: *********************************************** remarks: This object is for *AS53213* customer routes remarks: which is being exported from this source AS. remarks: remarks: This route object was create because no existing remarks: route object with the same sources was found, and remarks: since some Angola Cables peers filter based on remarks: these objects these routes may be rejected if remarks: this object is not created. remarks: remarks: Please contact peering [at] angolacables.co.ao if you remarks: have any questions regarding this object. remarks: *********************************************** mnt-by: MAINT-AS37468 changed: humberto.galiza [at] angolacables.co.ao 20181022 #21:25:16Z source: RADB last-modified: 2023-11-13T15:54:59Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source