mail.spk.cz has no NS records.
NS records for this zone are defined at spk.cz.
NS records for this zone are defined at spk.cz.
Question and response
Question
dig mail.spk.cz. NS
Answer
The response has no answer records.
Authority
spk.cz. 3600 SOA ns4.selectsystem.cz. hostmaster.selectsystem.cz. 2025062308 14400 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0