exch1.compunetix.com has no CNAME records.
Question and response
Question
dig exch1.compunetix.com. NS
Answer
The response has no answer records.
Authority
compunetix.com. 1709 SOA auth1.dqecom.com. dns.dqecom.com. 568143770 10800 3600 604800 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0