mail.sky.cz has no NS records.
NS records for this zone are defined at sky.cz.
NS records for this zone are defined at sky.cz.
Question and response
Question
dig mail.sky.cz. NS
Answer
The response has no answer records.
Authority
sky.cz. 3600 SOA ns1.poda.cz. hostmaster.poda.cz. 2026031002 10800 3600 2529000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0