Apex domains cannot have CNAME records.
Question and response
Question
dig hosting.snw.at. NS
Answer
hosting.snw.at. 1 NS ns2.stww.at.
hosting.snw.at. 1 NS ns1.stww.at.
hosting.snw.at. 1 NS ns3.stww.at.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0