Apex domains cannot have CNAME records.
Question and response
Question
dig epag.de. NS
Answer
epag.de. 4 NS dns2.epag.net.
epag.de. 4 NS dns1.epag.net.
Authority
The response has no authority records.
Additional
dns1.epag.net. 4 A 212.123.32.97
dns2.epag.net. 4 A 64.98.148.145
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0