smtp.vodafone.cz has no NS records.
NS records for this zone are defined at vodafone.cz.
NS records for this zone are defined at vodafone.cz.
Question and response
Question
dig smtp.vodafone.cz. NS
Answer
The response has no answer records.
Authority
vodafone.cz. 900 SOA ns1.vodafone.cz. ns-admin.vodafone.cz. 2025105025 10800 1080 1209600 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0