Apex domains cannot have CNAME records.
Question and response
Question
dig hasenkamp.eu. NS
Answer
hasenkamp.eu. 5 NS ns5.hasenkamp.eu.
hasenkamp.eu. 5 NS ns4.hasenkamp.eu.
hasenkamp.eu. 5 NS ns3.hasenkamp.eu.
Authority
The response has no authority records.
Additional
ns3.hasenkamp.eu. 5 A 87.238.196.5
ns4.hasenkamp.eu. 5 A 178.254.5.5
ns5.hasenkamp.eu. 5 A 178.254.63.7
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0