Apex domains cannot have CNAME records.
Question and response
Question
dig netcon.at. NS
Answer
netcon.at. 5 NS isp2.netcon.at.
netcon.at. 5 NS isp1.netcon.at.
Authority
The response has no authority records.
Additional
isp1.netcon.at. 5 A 109.70.238.1
isp2.netcon.at. 5 A 144.76.81.236
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0