mx.blueboard.cz has no NS records.
NS records for this zone are defined at blueboard.cz.
NS records for this zone are defined at blueboard.cz.
Question and response
Question
dig mx.blueboard.cz. NS
Answer
The response has no answer records.
Authority
blueboard.cz. 38400 SOA shinzon.blueboard.cz. hostmaster.blueboard.cz. 2026010801 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0