Apex domains cannot have CNAME records.
Question and response
Question
dig nettendesign.com. NS
Answer
nettendesign.com. 5 NS ns2.nettendesign.com.
nettendesign.com. 5 NS ns1.nettendesign.com.
Authority
The response has no authority records.
Additional
ns1.nettendesign.com. 5 A 213.227.153.42
ns2.nettendesign.com. 5 A 213.227.153.45
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0