Question and response
Question
dig aws-spf.unblock-us.com. TXT
Answer
aws-spf.unblock-us.com. 600 TXT "v=spf1 ip4:54.208.8.243 ip4:107.21.1.246 ip4:107.23.57.145 ip4:107.23.108.191 ip4:107.23.45.194 ip4:107.23.94.126"
Authority
unblock-us.com. 172800 NS ns-1193.awsdns-21.org.
unblock-us.com. 172800 NS ns-1610.awsdns-09.co.uk.
unblock-us.com. 172800 NS ns-335.awsdns-41.com.
unblock-us.com. 172800 NS ns-935.awsdns-52.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0