Apex domains cannot have CNAME records.
Question and response
Question
dig web-servers.com.au. NS
Answer
web-servers.com.au. 5 NS ns2.panthur.net.au.
web-servers.com.au. 5 NS ns1.panthur.net.au.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0