nsa.ten.cz has no NS records.
NS records for this zone are defined at ten.cz.
NS records for this zone are defined at ten.cz.
Question and response
Question
dig nsa.ten.cz. NS
Answer
The response has no answer records.
Authority
ten.cz. 3600 SOA nsa.cesnet.cz. hostmaster.cesnet.cz. 2019082648 28800 7200 1814400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0