Apex domains cannot have CNAME records.
Question and response
Question
dig cnh.at. NS
Answer
cnh.at. 5 NS ns3.cnh.at.
cnh.at. 5 NS ns2.cnh.at.
cnh.at. 5 NS ns1.cnh.at.
Authority
The response has no authority records.
Additional
ns1.cnh.at. 5 A 195.149.216.2
ns2.cnh.at. 5 A 185.164.5.43
ns3.cnh.at. 5 A 80.92.113.13
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0