app01.qweb.net has no CNAME records.
Question and response
Question
dig app01.qweb.net. NS
Answer
The response has no answer records.
Authority
qweb.net. 568 SOA ns1.qweb.net. hostmaster.qweb.nl. 2026011900 3600 3600 604800 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0