mx3.scc-zip.net has no CNAME records.
Question and response
Question
dig mx3.scc-zip.net. NS
Answer
The response has no answer records.
Authority
scc-zip.net. 5420 SOA ns1.scc-zip.net. dnsadmin.scc-zip.net. 2012063339 86400 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0