vmi2442032.contaboserver.net has no CNAME records.
Question and response
Question
dig vmi2442032.contaboserver.net. NS
Answer
The response has no answer records.
Authority
contaboserver.net. 1700 SOA ns1.contabo.net. hostmaster.contabo.de. 1771722508 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0