Apex domains cannot have CNAME records.
Question and response
Question
dig q01.oxi-dedi.net. NS
Answer
q01.oxi-dedi.net. 5 NS ns.q01.oxi-dedi.net.
q01.oxi-dedi.net. 5 NS nssec.oxemis.com.
Authority
The response has no authority records.
Additional
ns.q01.oxi-dedi.net. 5 A 62.4.26.80
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0