dns1.cvnet.com has no CNAME records.
Question and response
Question
dig dns1.cvnet.com. NS
Answer
The response has no answer records.
Authority
cvnet.com. 426 SOA authns1.cv.net. abuse.cv.net. 2013126505 7200 600 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0