ns.tpnet.pl has no NS records.
NS records for this zone are defined at tpnet.pl.
NS records for this zone are defined at tpnet.pl.
Question and response
Question
dig ns.tpnet.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