Apex domains cannot have CNAME records.
Question and response
Question
dig thunell.us. NS
Answer
thunell.us. 5 NS ns1.thunell.us.
thunell.us. 5 NS ns2.thunell.us.
Authority
The response has no authority records.
Additional
ns1.thunell.us. 5 A 78.142.0.187
ns2.thunell.us. 5 A 78.142.0.192
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0