masterdns.np6.com has no CNAME records.
Question and response
Question
dig masterdns.np6.com. NS
Answer
The response has no answer records.
Authority
np6.com. 300 SOA level.np6.com. masterdns.np6.com. 2004103653 1200 600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0