customer.io.
Question and response
Question
dig customeriomail.com. PTR
Answer
customeriomail.com. 60 PTR customer.io.
Authority
customeriomail.com. 172800 NS ns-1432.awsdns-51.org.
customeriomail.com. 172800 NS ns-152.awsdns-19.com.
customeriomail.com. 172800 NS ns-1865.awsdns-41.co.uk.
customeriomail.com. 172800 NS ns-577.awsdns-08.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0