mx2.tlnt.cz has no NS records.
NS records for this zone are defined at tlnt.cz.
NS records for this zone are defined at tlnt.cz.
Question and response
Question
dig mx2.tlnt.cz. NS
Answer
The response has no answer records.
Authority
tlnt.cz. 1800 SOA bill.ns.cloudflare.com. dns.cloudflare.com. 2397166908 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0