decsys.vsb.cz has no NS records.
NS records for this zone are defined at vsb.cz.
NS records for this zone are defined at vsb.cz.
Question and response
Question
dig decsys.vsb.cz. NS
Answer
The response has no answer records.
Authority
vsb.cz. 600 SOA decsys.vsb.cz. hostmaster.vsb.cz. 260317042 3600 3600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0