smtp01.telemach.hr has no NS records.
NS records for this zone are defined at telemach.hr.
NS records for this zone are defined at telemach.hr.
Question and response
Question
dig smtp01.telemach.hr. NS
Answer
The response has no answer records.
Authority
telemach.hr. 1800 SOA cecelia.ns.cloudflare.com. dns.cloudflare.com. 2398271509 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0