Apex domains cannot have CNAME records.
Question and response
Question
dig statistik.at. NS
Answer
statistik.at. 5 NS dns3.statistik.gv.at.
statistik.at. 5 NS dns4.statistik.gv.at.
Authority
The response has no authority records.
Additional
dns3.statistik.gv.at. 5 A 193.170.163.7
dns4.statistik.gv.at. 2 A 193.170.163.166
dns3.statistik.gv.at. 5 AAAA 2001:628:2190:1530:0:0:0:7
dns4.statistik.gv.at. 2 AAAA 2001:628:2190:2520:0:0:0:166
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0