vmi2425657.contaboserver.net has no CNAME records.
Question and response
Question
dig vmi2425657.contaboserver.net. NS
Answer
The response has no answer records.
Authority
contaboserver.net. 3600 SOA ns1.contabo.net. hostmaster.contabo.de. 1772935335 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0