Apex domains cannot have CNAME records.
Question and response
Question
dig fregat.net. NS
Answer
fregat.net. 5 NS ns.itsinternet.net.
fregat.net. 5 NS ns2.fregat.net.
Authority
The response has no authority records.
Additional
ns.itsinternet.net. 5 A 213.133.164.35
ns2.fregat.net. 5 A 212.115.255.5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0