Question and response
Question
dig spf.mail.knockbot.jp. TXT
Answer
spf.mail.knockbot.jp. 300 TXT "v=spf1 ip4:5.104.80.238 ip4:146.190.104.105 ip4:117.103.162.209 ip4:128.199.138.43 ip4:165.232.171.46 ~all"
Authority
knockbot.jp. 86400 NS 01.dnsv.jp.
knockbot.jp. 86400 NS 02.dnsv.jp.
knockbot.jp. 86400 NS 03.dnsv.jp.
knockbot.jp. 86400 NS 04.dnsv.jp.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0