Apex domains cannot have CNAME records.
Question and response
Question
dig mahi.be. NS
Answer
mahi.be. 5 NS ns-838.awsdns-40.net.
mahi.be. 5 NS ns-21.awsdns-02.com.
mahi.be. 5 NS ns-1542.awsdns-00.co.uk.
mahi.be. 5 NS ns-1238.awsdns-26.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0