mx.cyberfusion.nl has no NS records.
NS records for this zone are defined at cyberfusion.nl.
NS records for this zone are defined at cyberfusion.nl.
Question and response
Question
dig mx.cyberfusion.nl. NS
Answer
The response has no answer records.
Authority
cyberfusion.nl. 3600 SOA nsauth0.cyberfusion.nl. hostmaster.cyberfusion.nl. 2020012300 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0