Apex domains cannot have CNAME records.
Question and response
Question
dig host-ing.eu. NS
Answer
host-ing.eu. 5 NS ns3.dns-b.eu.
host-ing.eu. 5 NS ns1.dns-b.eu.
host-ing.eu. 5 NS ns2.dns-b.eu.
Authority
The response has no authority records.
Additional
ns1.dns-b.eu. 5 A 195.128.160.129
ns2.dns-b.eu. 5 A 195.68.246.129
ns3.dns-b.eu. 5 A 80.83.124.49
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0