cns3.secureserver.net has no CNAME records.
Question and response
Question
dig cns3.secureserver.net. NS
Answer
The response has no answer records.
Authority
secureserver.net. 1799 SOA cns1.secureserver.net. dns.jomax.net. 2026022012 300 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0