170-247-20-239.netecom.net.br has no CNAME records.
Question and response
Question
dig 170-247-20-239.netecom.net.br. NS
Answer
The response has no answer records.
Authority
netecom.net.br. 3217 SOA ns1.netecom.net.br. rudson.netecom.net.br. 2021102618 10800 900 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0