Apex domains cannot have CNAME records.
Question and response
Question
dig bitcom.se. NS
Answer
bitcom.se. 1 NS ns3.bitcom.se.
bitcom.se. 1 NS ns1.bitcom.se.
Authority
The response has no authority records.
Additional
ns1.bitcom.se. 1 A 194.147.242.16
ns3.bitcom.se. 1 A 62.119.182.214
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0