Apex domains cannot have CNAME records.
Question and response
Question
dig ns2.162-240-237-65.hostgator-br.com. NS
Answer
ns2.162-240-237-65.hostgator-br.com. 5 NS ns15.abovedomains.com.
ns2.162-240-237-65.hostgator-br.com. 5 NS ns16.abovedomains.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0