Apex domains cannot have CNAME records.
Question and response
Question
dig netart.com. NS
Answer
netart.com. 5 NS ns1.netart.com.
netart.com. 5 NS ns2.netart.com.
netart.com. 5 NS ns3.netart.com.
Authority
The response has no authority records.
Additional
ns1.netart.com. 5 A 77.55.176.10
ns2.netart.com. 5 A 77.55.177.10
ns3.netart.com. 5 A 77.55.178.10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0