custmx1.aax2.net has no CNAME records.
Question and response
Question
dig custmx1.aax2.net. NS
Answer
The response has no answer records.
Authority
aax2.net. 8540 SOA ns1.compax.at. hostmaster.compax.at. 2026030300 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0