Apex domains cannot have CNAME records.
Question and response
Question
dig hoasted.eu. NS
Answer
hoasted.eu. 5 NS ns1.hoasted.nl.
hoasted.eu. 5 NS ns3.hoasted.com.
hoasted.eu. 5 NS ns2.hoasted.eu.
Authority
The response has no authority records.
Additional
ns1.hoasted.nl. 1 A 164.92.214.194
ns2.hoasted.eu. 5 A 172.233.48.234
ns3.hoasted.com. 1 A 159.69.10.119
ns1.hoasted.nl. 1 AAAA 2a03:b0c0:2:d0:0:0:14d9:d001
ns2.hoasted.eu. 5 AAAA 2600:3c0e:0:0:f03c:93ff:fe55:40b0
ns3.hoasted.com. 1 AAAA 2a01:4f8:1c1c:dcf8:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0