d358.server4u.cz has no NS records.
NS records for this zone are defined at server4u.cz.
NS records for this zone are defined at server4u.cz.
Question and response
Question
dig d358.server4u.cz. NS
Answer
The response has no answer records.
Authority
server4u.cz. 600 SOA ns.web4u.cz. admin.web4u.cz. 2026030200 14400 3600 1209600 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0