blog.online.dev.br has no CNAME records.
Question and response
Question
dig blog.online.dev.br. NS
Answer
The response has no answer records.
Authority
online.dev.br. 10 SOA ns.online.dev.br. noc\@online.net.br. 2024111027 1200 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0