Apex domains cannot have CNAME records.
Question and response
Question
dig wide.net.au. NS
Answer
wide.net.au. 4 NS ns1.wide.net.au.
wide.net.au. 4 NS ns2.wide.net.au.
wide.net.au. 4 NS ns6.wide.net.au.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0