mx.optinet.hr has no NS records.
NS records for this zone are defined at optinet.hr.
NS records for this zone are defined at optinet.hr.
Question and response
Question
dig mx.optinet.hr. NS
Answer
The response has no answer records.
Authority
optinet.hr. 300 SOA dns1.optima-telekom.hr. dns.optima-telekom.hr. 2025102201 604800 86400 2419200 604800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0