Apex domains cannot have CNAME records.
Question and response
Question
dig hostedserver.eu. NS
Answer
hostedserver.eu. 1 NS kami.ns.cloudflare.com.
hostedserver.eu. 1 NS guss.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0