Apex domains cannot have CNAME records.
Question and response
Question
dig webmastersonly.com. NS
Answer
webmastersonly.com. 2 NS ns16.domaincontrol.com.
webmastersonly.com. 2 NS ns15.domaincontrol.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0