Apex domains cannot have CNAME records.
Question and response
Question
dig internationalepartnervermittlung.com. NS
Answer
internationalepartnervermittlung.com. 5 NS ns2.internationalepartnervermittlung.com.
internationalepartnervermittlung.com. 5 NS ns1.internationalepartnervermittlung.com.
Authority
The response has no authority records.
Additional
ns1.internationalepartnervermittlung.com. 5 A 86.111.189.219
ns2.internationalepartnervermittlung.com. 5 A 15.235.133.248
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0