Apex domains cannot have CNAME records.
Question and response
Question
dig gofax.com.au. NS
Answer
gofax.com.au. 5 NS ns-308.awsdns-38.com.
gofax.com.au. 5 NS ns-1052.awsdns-03.org.
gofax.com.au. 5 NS ns-948.awsdns-54.net.
gofax.com.au. 5 NS ns-1743.awsdns-25.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0