Apex domains cannot have CNAME records.
Question and response
Question
dig odns.oktawave.com. NS
Answer
odns.oktawave.com. 5 NS dns1.oktawave.com.
odns.oktawave.com. 5 NS dns2.oktawave.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0