spf.nethost.cz has no NS records.
NS records for this zone are defined at nethost.cz.
NS records for this zone are defined at nethost.cz.
Question and response
Question
dig spf.nethost.cz. NS
Answer
The response has no answer records.
Authority
nethost.cz. 864 SOA dns.nethost.cz. hostmaster.nethost.cz. 2026030501 14400 36000 3600000 864
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0