Apex domains cannot have CNAME records.
Question and response
Question
dig addonline.biz. NS
Answer
addonline.biz. 5 NS ns2.addonline.fr.
addonline.biz. 5 NS ns1.addonline.fr.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0