mx.dinst.pl has no NS records.
NS records for this zone are defined at dinst.pl.
NS records for this zone are defined at dinst.pl.
Question and response
Question
dig mx.dinst.pl. NS
Answer
The response has no answer records.
Authority
dinst.pl. 1800 SOA ns0.pttk.pl. admin.dinst.pl. 2022101924 604800 86400 2419200 604800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0