ns01.vocus.net.au has no CNAME records.
Question and response
Question
dig ns01.vocus.net.au. NS
Answer
The response has no answer records.
Authority
vocus.net.au. 1606 SOA ns3.vocus.net.au. hostmaster.vocus.com.au. 2026010800 3600 300 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0