ns2.contactel.cz has no NS records.
NS records for this zone are defined at contactel.cz.
NS records for this zone are defined at contactel.cz.
Question and response
Question
dig ns2.contactel.cz. NS
Answer
The response has no answer records.
Authority
contactel.cz. 3600 SOA ns.contactel.cz. hostmaster.cz.net. 2015081001 28800 7200 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0