ns1.hostingserver.nl has no CNAME records.
Question and response
Question
dig ns1.hostingserver.nl. NS
Answer
The response has no answer records.
Authority
hostingserver.nl. 665 SOA ns1.hostingserver.nl. hostmaster.hostingserver.nl. 2026020501 600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0