vmx01.prolocation.nl has no CNAME records.
Question and response
Question
dig vmx01.prolocation.nl. NS
Answer
The response has no answer records.
Authority
prolocation.nl. 10800 SOA ns1.as41887.nl. beheer.prolocation.net. 2026022601 14400 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0