Question and response
Question
dig _spf4.zendesk.com. TXT
Answer
_spf4.zendesk.com. 3600 TXT "v=spf1 ip4:54.191.223.56 ip4:54.255.61.23 ip4:63.128.21.0/24 ip4:74.125.0.0/16 ip4:8.36.116.0/24 ip4:8.39.144.0/24 a:zgateway.zuora.com exists:%{i}._spf.mta.salesforce.com ~all"
Authority
zendesk.com. 172800 NS ns-1213.awsdns-23.org.
zendesk.com. 172800 NS ns-1858.awsdns-40.co.uk.
zendesk.com. 172800 NS ns-444.awsdns-55.com.
zendesk.com. 172800 NS ns-754.awsdns-30.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0