Apex domains cannot have CNAME records.
Question and response
Question
dig bredband2.se. NS
Answer
bredband2.se. 5 NS olga.ns.cloudflare.com.
bredband2.se. 5 NS lee.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0