Apex domains cannot have CNAME records.
Question and response
Question
dig darknebulae.net. NS
Answer
darknebulae.net. 5 NS ns0.vinehost.net.
darknebulae.net. 5 NS ns4.vinehost.net.
darknebulae.net. 5 NS ns2.vinehost.net.
darknebulae.net. 5 NS ns1.vinehost.net.
darknebulae.net. 5 NS ns3.vinehost.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0