ns2.lublin.pl has no NS records.
NS records for this zone are defined at lublin.pl.
NS records for this zone are defined at lublin.pl.
Question and response
Question
dig ns2.lublin.pl. NS
Answer
The response has no answer records.
Authority
lublin.pl. 86400 SOA ns1.lublin.pl. dns.man.lublin.pl. 2013038298 14400 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0