Apex domains cannot have CNAME records.
Question and response
Question
dig sortilege.net. NS
Answer
sortilege.net. 3 NS nsoracle.agneau.org.
sortilege.net. 3 NS cabale.usenet-fr.net.
sortilege.net. 3 NS ns-slave.free.org.
sortilege.net. 3 NS ns.sortilege.net.
sortilege.net. 3 NS nsth3.agneau.org.
Authority
The response has no authority records.
Additional
ns.sortilege.net. 3 A 212.83.129.111
nsth3.agneau.org. 3 A 193.200.43.134
cabale.usenet-fr.net. 3 A 213.36.253.122
nsoracle.agneau.org. 3 A 141.145.211.20
ns.sortilege.net. 3 AAAA 2001:bc8:3107:100:0:0:0:53
nsth3.agneau.org. 3 AAAA 2001:67c:1740:a0b0:0:0:134:53
cabale.usenet-fr.net. 3 AAAA 2a01:e0d:1:3:58bf:fa7a:0:1
nsoracle.agneau.org. 3 AAAA 2603:c027:c003:5c00:0:0:0:53
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0