These entries are queried from radb.net using whois, you can try my project getting these.
:AS273756 route6: 2804:8bc0::/32 origin: AS273756 remarks: Auto-created by TC IRR from NIC.br and RIPE RIS data notify: marlon [at] intralinkk.net.br mnt-by: MAINT-AS273756 source: TC last-modified: 2023-05-28T13:16:33Z rpki-ov-state: valid