mx.inetadmin.cz has no NS records.
NS records for this zone are defined at inetadmin.cz.
NS records for this zone are defined at inetadmin.cz.
Question and response
Question
dig mx.inetadmin.cz. NS
Answer
The response has no answer records.
Authority
inetadmin.cz. 900 SOA ns.inetadmin.eu. root.inetadmin.eu. 1771459200 86400 900 1209600 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0