vmi2327985.contaboserver.net has no CNAME records.
Question and response
Question
dig vmi2327985.contaboserver.net. NS
Answer
The response has no answer records.
Authority
contaboserver.net. 2829 SOA ns1.contabo.net. hostmaster.contabo.de. 1771721427 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0