Question and response
Question
dig spf.smtp.cz. TXT
Answer
spf.smtp.cz. 3600 TXT "v=spf1 ip4:81.95.97.0/25 ip4:81.95.105.128/26 ip4:185.12.196.0/24 ip4:81.95.96.15 ip4:81.95.96.29 ip6:2a02:4a8:ac24:101::/64 ip6:2a02:4a8:ac24:126::/64 ip6:2a02:4a8:ac24:130::/64 ip6:2a02:4a8:ac24:100::96:15"
Authority
smtp.cz. 3600 NS alfa.ns.active24.cz.
smtp.cz. 3600 NS beta.ns.active24.cz.
smtp.cz. 3600 NS gama.ns.active24.sk.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0