These entries are queried from radb.net using whois, you can try my project getting these.
:AS52666 route6: 2804:15b8::/32 descr: This is a BR.Digital customer proxy route object that was created because no existing route object with the same origin was found. Please contact bgp [at] br.digital if you have any questions regarding this object. origin: AS52666 mnt-by: MAINT-AS14840 changed: gacosta [at] br.digital 20210913 #15:12:02Z source: RADB last-modified: 2023-11-13T16:08:13Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source