vmx03.prolocation.net has no CNAME records.
Question and response
Question
dig vmx03.prolocation.net. NS
Answer
The response has no answer records.
Authority
prolocation.net. 7163 SOA ns1.as41887.nl. beheer.prolocation.net. 2026022400 14400 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0