Apex domains cannot have CNAME records.
Question and response
Question
dig nexon.net.au. NS
Answer
nexon.net.au. 1 NS ns3.nexon.com.au.
nexon.net.au. 1 NS ns1.nexon.com.au.
nexon.net.au. 1 NS ns2.nexon.com.au.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0