dns6.omdc.pl has no NS records.
NS records for this zone are defined at omdc.pl.
NS records for this zone are defined at omdc.pl.
Question and response
Question
dig dns6.omdc.pl. NS
Answer
The response has no answer records.
Authority
omdc.pl. 86400 SOA ns5.omdc.pl. admin.omdc.pl. 2011042269 10800 5400 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0