54.236.66.239.
Question and response
Question
dig mail2.har.com. PTR
Answer
mail2.har.com. 86400 PTR 54.236.66.239.
Authority
har.com. 3600 NS ns-1380.awsdns-44.org.
har.com. 3600 NS ns-1987.awsdns-56.co.uk.
har.com. 3600 NS ns-229.awsdns-28.com.
har.com. 3600 NS ns-612.awsdns-12.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0