ns1.jetz.com.br has no CNAME records.
Question and response
Question
dig ns1.jetz.com.br. NS
Answer
The response has no answer records.
Authority
jetz.com.br. 235 SOA ns1.jetz.com.br. hostmaster.jetz.com.br. 2020062387 10800 3600 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0