ns01.ndacorp.com has no CNAME records.
Question and response
Question
dig ns01.ndacorp.com. NS
Answer
The response has no answer records.
Authority
ndacorp.com. 10800 SOA ns02.ndacorp.com. twang.ndacorp.com. 2013051592 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0