Apex domains cannot have CNAME records.
Question and response
Question
dig mobilshoppen.net. NS
Answer
mobilshoppen.net. 5 NS ns-1188.awsdns-20.org.
mobilshoppen.net. 5 NS ns-1974.awsdns-54.co.uk.
mobilshoppen.net. 5 NS ns-961.awsdns-56.net.
mobilshoppen.net. 5 NS ns-1641.awsdns-13.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0