Apex domains cannot have CNAME records.
Question and response
Question
dig webmo.fr. NS
Answer
webmo.fr. 4 NS ns2.phpnet.org.
webmo.fr. 4 NS ns.phpnet.org.
Authority
The response has no authority records.
Additional
ns.phpnet.org. 4 A 195.144.11.85
ns2.phpnet.org. 4 A 15.237.148.169
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0