Apex domains cannot have CNAME records.
Question and response
Question
dig ospito.net. NS
Answer
ospito.net. 5 NS ns1.ospito.nl.
ospito.net. 5 NS ns2.ospito.net.
ospito.net. 5 NS ns3.ospito.eu.
Authority
The response has no authority records.
Additional
ns1.ospito.nl. 5 A 46.17.8.250
ns2.ospito.net. 5 A 46.17.15.250
ns3.ospito.eu. 5 A 46.17.14.250
ns1.ospito.nl. 5 AAAA 2a02:2870:1:106:46:17:8:250
ns2.ospito.net. 5 AAAA 2a02:2870:c002:1:0:0:0:11
ns3.ospito.eu. 5 AAAA 2a02:2870:c002:2:0:0:0:11
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0