mx.selectsystem.cz has no NS records.
NS records for this zone are defined at selectsystem.cz.
NS records for this zone are defined at selectsystem.cz.
Question and response
Question
dig mx.selectsystem.cz. NS
Answer
The response has no answer records.
Authority
selectsystem.cz. 3600 SOA ns4.selectsystem.cz. hostmaster.selectsystem.cz. 2024092703 14400 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0