dns1.muerznet.at has no CNAME records.
Question and response
Question
dig dns1.muerznet.at. NS
Answer
The response has no answer records.
Authority
muerznet.at. 2149 SOA dns2.muerznet.at. it.mznet.at. 2024091601 3600 300 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0