Apex domains cannot have CNAME records.
Question and response
Question
dig dlgc.eu. NS
Answer
dlgc.eu. 2 NS c.ns.buddyns.com.
dlgc.eu. 2 NS k.ns.buddyns.com.
dlgc.eu. 2 NS j.ns.buddyns.com.
Authority
The response has no authority records.
Additional
c.ns.buddyns.com. 5 A 116.203.6.3
j.ns.buddyns.com. 5 A 37.143.61.179
k.ns.buddyns.com. 5 A 195.20.17.193
c.ns.buddyns.com. 5 AAAA 2a01:4f8:1c0c:8115:0:0:0:3
j.ns.buddyns.com. 5 AAAA 2a01:a500:2766:0:0:0:5c3f:d10b
k.ns.buddyns.com. 5 AAAA 2a10:1fc0:d:0:0:0:ae75:f39a
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0