Apex domains cannot have CNAME records.
Question and response
Question
dig unicepta.org. NS
Answer
unicepta.org. 3 NS ns3.inwx.eu.
unicepta.org. 3 NS ns.inwx.de.
unicepta.org. 3 NS ns2.inwx.de.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0