Apex domains cannot have CNAME records.
Question and response
Question
dig netelbocho.com. NS
Answer
netelbocho.com. 5 NS dns2.spainbs.net.
netelbocho.com. 5 NS dns1.spainbs.net.
Authority
The response has no authority records.
Additional
dns1.spainbs.net. 5 A 195.182.205.40
dns2.spainbs.net. 5 A 195.182.205.40
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0