Apex domains cannot have CNAME records.
Question and response
Question
dig kursifant.com. NS
Answer
kursifant.com. 5 NS ns1027.ui-dns.com.
kursifant.com. 5 NS ns1065.ui-dns.de.
kursifant.com. 5 NS ns1062.ui-dns.org.
kursifant.com. 5 NS ns1082.ui-dns.biz.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0