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