ns2.hdc2.cz has no NS records.
NS records for this zone are defined at hdc2.cz.
NS records for this zone are defined at hdc2.cz.
Question and response
Question
dig ns2.hdc2.cz. NS
Answer
The response has no answer records.
Authority
hdc2.cz. 360 SOA ns.hdc1.cz. zeleni.heureka.cz. 2015121601 10800 3600 604800 360
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0