Apex domains cannot have CNAME records.
Question and response
Question
dig nordnet.fr. NS
Answer
nordnet.fr. 5 NS name2.nordnet.fr.
nordnet.fr. 5 NS name.nordnet.fr.
Authority
The response has no authority records.
Additional
name.nordnet.fr. 5 A 194.206.126.253
name2.nordnet.fr. 5 A 195.146.235.253
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0