nb5.netcompartner.com has no CNAME records.
Question and response
Question
dig nb5.netcompartner.com. NS
Answer
The response has no answer records.
Authority
netcompartner.com. 666 SOA s2.netcompartner.com. hostmaster.netcompartner.com. 1384763827 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0