_sips._tcp.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 _sips._tcp.ten.cz. NS
Answer
The response has no answer records.
Authority
ten.cz. 3600 SOA dns.cesnet.cz. hostmaster.cesnet.cz. 2026031915 28800 7200 1814400 3600
Additional
. 0 OPT ; payload 1472, xrcode 0, version 0, flags 0