Apex domains cannot have CNAME records.
Question and response
Question
dig dpvps.com.au. NS
Answer
dpvps.com.au. 5 NS ns3.dpvps.com.au.
dpvps.com.au. 5 NS ns2.dpvps.com.au.
dpvps.com.au. 5 NS ns1.dpvps.com.au.
Authority
The response has no authority records.
Additional
ns1.dpvps.com.au. 5 A 111.118.165.91
ns2.dpvps.com.au. 5 A 182.160.160.175
ns3.dpvps.com.au. 5 A 128.199.165.252
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0