xsmtp.horonet.cz has no NS records.
NS records for this zone are defined at horonet.cz.
NS records for this zone are defined at horonet.cz.
Question and response
Question
dig xsmtp.horonet.cz. NS
Answer
The response has no answer records.
Authority
horonet.cz. 2560 SOA ns1.websupport.cz. admin.websupport.cz. 1772648538 7200 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0