Apex domains cannot have CNAME records.
Question and response
Question
dig qzz.io. NS
Answer
qzz.io. 4 NS ns3.qzz.io.
qzz.io. 4 NS ns2.qzz.io.
qzz.io. 4 NS ns1.qzz.io.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0