Apex domains cannot have CNAME records.
Question and response
Question
dig julienth37.fr. NS
Answer
julienth37.fr. 3 NS ns0.julienth37.fr.
julienth37.fr. 3 NS ns3.julienth37.fr.
julienth37.fr. 3 NS ns2.julienth37.fr.
julienth37.fr. 3 NS ns1.julienth37.fr.
Authority
The response has no authority records.
Additional
ns0.julienth37.fr. 3 A 57.128.4.195
ns1.julienth37.fr. 3 A 82.65.161.62
ns2.julienth37.fr. 3 A 213.251.188.141
ns3.julienth37.fr. 3 A 69.65.50.223
ns0.julienth37.fr. 3 AAAA 2001:41d0:c00:5a00:0:0:0:195
ns1.julienth37.fr. 3 AAAA 2a01:e0a:f3e:36c7:0:0:0:1080
ns2.julienth37.fr. 3 AAAA 2001:41d0:1:4a8d:0:0:0:1
ns3.julienth37.fr. 3 AAAA 2001:1850:1:5:800:0:0:6b
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0