Apex domains cannot have CNAME records.
Question and response
Question
dig dedi-12552896.conducopper.com. NS
Answer
dedi-12552896.conducopper.com. 3 NS ns1.162-215-130-71.hostgator-br.com.
dedi-12552896.conducopper.com. 3 NS ns2.162-215-130-71.hostgator-br.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0