mail.erindesu.cz has no NS records.
NS records for this zone are defined at erindesu.cz.
NS records for this zone are defined at erindesu.cz.
Question and response
Question
dig mail.erindesu.cz. NS
Answer
The response has no answer records.
Authority
erindesu.cz. 1800 SOA clint.ns.cloudflare.com. dns.cloudflare.com. 2398899995 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0