_spf.uvtnet.cz has no NS records.
NS records for this zone are defined at uvtnet.cz.
NS records for this zone are defined at uvtnet.cz.
Question and response
Question
dig _spf.uvtnet.cz. NS
Answer
The response has no answer records.
Authority
uvtnet.cz. 1800 SOA emily.ns.cloudflare.com. dns.cloudflare.com. 2398614124 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0