Apex domains cannot have CNAME records.
Question and response
Question
dig omnidesk.com. NS
Answer
omnidesk.com. 2 NS ns1.transip.nl.
omnidesk.com. 2 NS ns0.transip.net.
omnidesk.com. 2 NS ns2.transip.eu.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0