Apex domains cannot have CNAME records.
Question and response
Question
dig fasthost.no. NS
Answer
fasthost.no. 5 NS dns4.itpays.net.
fasthost.no. 5 NS dns2.itpays.net.
fasthost.no. 5 NS dns1.itpays.net.
fasthost.no. 5 NS dns3.itpays.net.
fasthost.no. 5 NS dns6.itpays.net.
fasthost.no. 5 NS dns5.itpays.net.
Authority
The response has no authority records.
Additional
dns1.itpays.net. 5 A 193.107.28.4
dns2.itpays.net. 5 A 193.107.29.0
dns3.itpays.net. 5 A 46.101.210.195
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0