ns1.dynu.com has no CNAME records.
Question and response
Question
dig ns1.dynu.com. NS
Answer
The response has no answer records.
Authority
dynu.com. 3600 SOA ns1.dynu.com. administrator.dynu.com. 76245604 1800 300 86400 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0