Apex domains cannot have CNAME records.
Question and response
Question
dig inttech.eu. NS
Answer
inttech.eu. 1 NS ns.inttech.de.
inttech.eu. 1 NS ns2.inttech.de.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0