Question and response
Question
dig _spf.web4u.cz. TXT
Answer
_spf.web4u.cz. 60 TXT "v=spf1 ip4:81.91.86.0/23 ip6:2001:1568::/64 ip6:2001:1568:502::/48 -all"
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0