mail.gvt.pl has no NS records.
NS records for this zone are defined at gvt.pl.
NS records for this zone are defined at gvt.pl.
Question and response
Question
dig mail.gvt.pl. NS
Answer
The response has no answer records.
Authority
gvt.pl. 39600 SOA ns1.jmdi.pl. root.jmdi.pl. 2024122302 28800 7200 1209600 39600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0