Apex domains cannot have CNAME records.
Question and response
Question
dig iswift.eu. NS
Answer
iswift.eu. 5 NS ns1.iswift.eu.
iswift.eu. 5 NS ns2.iswift.eu.
Authority
The response has no authority records.
Additional
ns1.iswift.eu. 5 A 185.200.47.250
ns1.iswift.eu. 5 A 188.210.221.52
ns2.iswift.eu. 5 A 188.210.221.179
ns2.iswift.eu. 5 A 188.210.223.253
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0