Apex domains cannot have CNAME records.
Question and response
Question
dig be.easynet.net. NS
Answer
be.easynet.net. 1 NS dns0.easynet.be.
be.easynet.net. 1 NS dns3.easynet.be.
be.easynet.net. 1 NS dns2.easynet.be.
be.easynet.net. 1 NS dns1.easynet.be.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0