mail.sldc.net.pl has no NS records.
NS records for this zone are defined at sldc.net.pl.
NS records for this zone are defined at sldc.net.pl.
Question and response
Question
dig mail.sldc.net.pl. NS
Answer
The response has no answer records.
Authority
sldc.net.pl. 2000 SOA ns1.sldc.net.pl. hostmaster.sldc.net.pl. 2026021803 2000 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0