Apex domains cannot have CNAME records.
Question and response
Question
dig kernfusion.at. NS
Answer
kernfusion.at. 5 NS ns2.n200.org.
kernfusion.at. 5 NS ns1.n200.org.
Authority
The response has no authority records.
Additional
ns1.n200.org. 5 A 217.91.44.17
ns2.n200.org. 5 A 80.153.195.191
ns1.n200.org. 5 AAAA 2003:a:42b:e400:0:0:0:1
ns2.n200.org. 5 AAAA 2003:a:843:7c00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0