mxbak.hukot.net has no NS records.
NS records for this zone are defined at hukot.net.
NS records for this zone are defined at hukot.net.
Question and response
Question
dig mxbak.hukot.net. NS
Answer
The response has no answer records.
Authority
hukot.net. 1000 SOA ns1.hukot.cz. hukot.hukot.cz. 1772968082 28800 7200 604800 1000
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0