Apex domains cannot have CNAME records.
Question and response
Question
dig nuoz.com. NS
Answer
nuoz.com. 1 NS ns-3.nuoz.net.
nuoz.com. 1 NS ns-1.nuoz.net.
nuoz.com. 1 NS ns-2.nuoz.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0