cns2.secureserver.net has no CNAME records.
Question and response
Question
dig cns2.secureserver.net. NS
Answer
The response has no answer records.
Authority
secureserver.net. 499 SOA cns1.secureserver.net. dns.jomax.net. 2026022302 300 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0