Apex domains cannot have CNAME records.
Question and response
Question
dig jscnet.se. NS
Answer
jscnet.se. 5 NS ns1.jscnet.se.
jscnet.se. 5 NS ns2.jscnet.se.
Authority
The response has no authority records.
Additional
ns1.jscnet.se. 5 A 80.84.32.12
ns2.jscnet.se. 5 A 80.84.32.10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0