Apex domains cannot have CNAME records.
Question and response
Question
dig lagis.at. NS
Answer
lagis.at. 5 NS a2.ns.lagis.at.
lagis.at. 5 NS a1.ns.lagis.at.
lagis.at. 5 NS a0.ns.lagis.at.
lagis.at. 5 NS a3.ns.lagis.at.
Authority
The response has no authority records.
Additional
a0.ns.lagis.at. 5 A 83.164.192.3
a1.ns.lagis.at. 5 A 83.164.193.3
a2.ns.lagis.at. 5 A 83.164.133.244
a3.ns.lagis.at. 5 A 86.56.128.58
a2.ns.lagis.at. 5 AAAA 2a00:1860:1:1:0:0:0:5353
a3.ns.lagis.at. 5 AAAA 2a00:cf8:a100:20:0:0:0:58
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0