mail.tango.hr has no NS records.
NS records for this zone are defined at tango.hr.
NS records for this zone are defined at tango.hr.
Question and response
Question
dig mail.tango.hr. NS
Answer
The response has no answer records.
Authority
tango.hr. 86400 SOA dns1.cdn.hr. root.avalon.hr. 2026010201 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0