mx1.casablanca.cz has no NS records.
NS records for this zone are defined at casablanca.cz.
NS records for this zone are defined at casablanca.cz.
Question and response
Question
dig mx1.casablanca.cz. NS
Answer
The response has no answer records.
Authority
casablanca.cz. 86400 SOA ns1.casablanca.cz. servis.casablanca.cz. 2026031600 3600 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0