mailinz.tpsa.pl has no NS records.
NS records for this zone are defined at tpsa.pl.
NS records for this zone are defined at tpsa.pl.
Question and response
Question
dig mailinz.tpsa.pl. NS
Answer
The response has no answer records.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0