Apex domains cannot have CNAME records.
Question and response
Question
dig ek-hosting.net. NS
Answer
ek-hosting.net. 5 NS ns2.ek-hosting.net.
ek-hosting.net. 5 NS ns3.ek-hosting.nl.
ek-hosting.net. 5 NS ns1.ek-hosting.net.
Authority
The response has no authority records.
Additional
ns1.ek-hosting.net. 5 A 178.21.19.10
ns2.ek-hosting.net. 5 A 46.249.42.58
ns1.ek-hosting.net. 5 AAAA 2a00:1ca8:2:0:0:0:0:10
ns2.ek-hosting.net. 5 AAAA 2a03:3f40:e:0:0:0:0:10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0