Apex domains cannot have CNAME records.
Question and response
Question
dig dwhost.net. NS
Answer
dwhost.net. 5 NS dns3.dwhost.net.
dwhost.net. 5 NS dns2.dwhost.net.
dwhost.net. 5 NS dns1.dwhost.net.
Authority
The response has no authority records.
Additional
dns1.dwhost.net. 5 A 85.159.213.38
dns2.dwhost.net. 5 A 94.237.111.102
dns3.dwhost.net. 5 A 162.55.68.152
dns1.dwhost.net. 5 AAAA 2a01:7e00:e000:fa:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0