mx3.netinstal.pl has no NS records.
NS records for this zone are defined at netinstal.pl.
NS records for this zone are defined at netinstal.pl.
Question and response
Question
dig mx3.netinstal.pl. NS
Answer
The response has no answer records.
Authority
netinstal.pl. 60480 SOA ns1.netinstal.pl. root.netinstal.pl. 2025121601 3600 3600 60480 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0