mx.cp2.c55.com.au has no NS records.
NS records for this zone are defined at c55.com.au.
NS records for this zone are defined at c55.com.au.
Question and response
Question
dig mx.cp2.c55.com.au. NS
Answer
The response has no answer records.
Authority
c55.com.au. 86400 SOA ns1.c55.com.au. c.c55.com.au. 2026022402 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0