Apex domains cannot have CNAME records.
Question and response
Question
dig schlyter.se. NS
Answer
schlyter.se. 5 NS ns2.named.se.
schlyter.se. 5 NS ns1.named.se.
schlyter.se. 5 NS ns3.named.se.
Authority
The response has no authority records.
Additional
ns1.named.se. 5 A 91.206.174.4
ns2.named.se. 5 A 63.34.32.172
ns3.named.se. 5 A 192.36.115.53
ns1.named.se. 5 AAAA 2001:67c:394:15:0:0:0:4
ns2.named.se. 5 AAAA 2a05:d018:184:4853:0:0:0:53
ns3.named.se. 5 AAAA 2a01:298:4:0:0:0:0:53
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0