Apex domains cannot have CNAME records.
Question and response
Question
dig ipalm.net.au. NS
Answer
ipalm.net.au. 5 NS ns-1099.awsdns-09.org.
ipalm.net.au. 5 NS ns-860.awsdns-43.net.
ipalm.net.au. 5 NS ns-283.awsdns-35.com.
ipalm.net.au. 5 NS ns-1687.awsdns-18.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0