mx01.mailcluster.com.au has no NS records.
NS records for this zone are defined at mailcluster.com.au.
NS records for this zone are defined at mailcluster.com.au.
Question and response
Question
dig mx01.mailcluster.com.au. NS
Answer
The response has no answer records.
Authority
mailcluster.com.au. 3600 SOA ns1.digitalpacific.com.au. hostmaster.mailcluster.com.au. 2025102939 7200 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0