mx.grhosting.cz has no NS records.
NS records for this zone are defined at grhosting.cz.
NS records for this zone are defined at grhosting.cz.
Question and response
Question
dig mx.grhosting.cz. NS
Answer
The response has no answer records.
Authority
grhosting.cz. 3600 SOA ns.grdns.cz. admin.grdns.cz. 2026010601 3600 1800 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0