Apex domains cannot have CNAME records.
Question and response
Question
dig han-media.de. NS
Answer
han-media.de. 5 NS ns2.han-media.eu.
han-media.de. 5 NS ns1.han-media.eu.
han-media.de. 5 NS ns3.han-media.eu.
Authority
The response has no authority records.
Additional
ns1.han-media.eu. 5 A 87.238.196.5
ns2.han-media.eu. 5 A 178.254.5.5
ns3.han-media.eu. 5 A 178.254.63.7
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0