Apex domains cannot have CNAME records.
Question and response
Question
dig dcsix.net. NS
Answer
dcsix.net. 5 NS pns01.kyberio-dns.com.
dcsix.net. 5 NS pns02.kyberio-dns.de.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0