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