Apex domains cannot have CNAME records.
Question and response
Question
dig goebs.eu. NS
Answer
goebs.eu. 5 NS shades07.rzone.de.
goebs.eu. 5 NS docks16.rzone.de.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0