server155.witxl.nl has no CNAME records.
Question and response
Question
dig server155.witxl.nl. NS
Answer
The response has no answer records.
Authority
witxl.nl. 3250 SOA ns1.witxl.nl. hostmaster.witxl.nl. 2026022400 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0