Apex domains cannot have CNAME records.
Question and response
Question
dig spamcloud.md. NS
Answer
spamcloud.md. 1 NS ns1.host.md.
spamcloud.md. 1 NS ns2.host.md.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0