Apex domains cannot have CNAME records.
Question and response
Question
dig netensia.net. NS
Answer
netensia.net. 4 NS ns2.netensia.net.
netensia.net. 4 NS ns3.netensia.net.
netensia.net. 4 NS ns1.netensia.net.
Authority
The response has no authority records.
Additional
ns1.netensia.net. 4 A 195.160.188.1
ns2.netensia.net. 4 A 195.160.189.1
ns3.netensia.net. 4 A 51.254.13.112
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0