mx.qfilter.nl has no NS records.
NS records for this zone are defined at qfilter.nl.
NS records for this zone are defined at qfilter.nl.
Question and response
Question
dig mx.qfilter.nl. NS
Answer
The response has no answer records.
Authority
qfilter.nl. 3600 SOA ns1.qweb.net. hostmaster.qweb.nl. 2026011900 3600 3600 604800 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0