fallback.yourfilter.nl has no NS records.
NS records for this zone are defined at yourfilter.nl.
NS records for this zone are defined at yourfilter.nl.
Question and response
Question
dig fallback.yourfilter.nl. NS
Answer
The response has no answer records.
Authority
yourfilter.nl. 300 SOA ns111.auroradns.eu. admin.auroradns.eu. 2019012201 86400 7200 604800 300
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0