spf-cls.ffdev.cz has no NS records.
NS records for this zone are defined at ffdev.cz.
NS records for this zone are defined at ffdev.cz.
Question and response
Question
dig spf-cls.ffdev.cz. NS
Answer
The response has no answer records.
Authority
ffdev.cz. 2560 SOA ns1.websupport.cz. admin.websupport.cz. 1774257214 7200 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0