Apex domains cannot have CNAME records.
Question and response
Question
dig bibits.no. NS
Answer
bibits.no. 5 NS dns1.as2116.net.
bibits.no. 5 NS dns1.mikromarc.no.
bibits.no. 5 NS dns2.bibits.no.
Authority
The response has no authority records.
Additional
dns1.as2116.net. 5 A 193.75.75.1
dns1.mikromarc.no. 5 A 193.91.211.248
dns2.bibits.no. 5 A 193.91.211.247
dns1.as2116.net. 5 AAAA 2001:8c0:0:0:0:0:0:3
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0