mx1.internetia.pl has no NS records.
NS records for this zone are defined at internetia.pl.
NS records for this zone are defined at internetia.pl.
Question and response
Question
dig mx1.internetia.pl. NS
Answer
The response has no answer records.
Authority
internetia.pl. 86400 SOA ns1.internetia.pl. root.ns1.internetia.pl. 2026022400 86400 7200 2592000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0