dns1.proserver1.at has no CNAME records.
Question and response
Question
dig dns1.proserver1.at. NS
Answer
The response has no answer records.
Authority
proserver1.at. 1 SOA dns1.proserver1.at. hostmaster.proserver1.at. 2026030102 1 1 1 1
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0