Apex domains cannot have CNAME records.
Question and response
Question
dig kabeline.at. NS
Answer
kabeline.at. 5 NS adns2.mynet.at.
kabeline.at. 5 NS adns3.mynet.at.
kabeline.at. 5 NS adns1.mynet.at.
Authority
The response has no authority records.
Additional
adns1.mynet.at. 5 A 83.218.160.3
adns2.mynet.at. 5 A 3.124.220.4
adns3.mynet.at. 5 A 83.218.160.253
adns1.mynet.at. 5 AAAA 2a00:15c0:3001:100:0:0:0:2
adns2.mynet.at. 5 AAAA 2a05:d014:cdf:4000:0:0:0:4
adns3.mynet.at. 5 AAAA 2a00:15c0:1002:100:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0