mx3.raffel.nl has no NS records.
NS records for this zone are defined at raffel.nl.
NS records for this zone are defined at raffel.nl.
Question and response
Question
dig mx3.raffel.nl. NS
Answer
The response has no answer records.
Authority
raffel.nl. 600 SOA ns1.raffel.net. support.raffel.nl. 2020040601 1200 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0