154.18.181.10.
Question and response
Question
dig mailsg.sg.dc.integral.net. PTR
Answer
mailsg.sg.dc.integral.net. 300 PTR 154.18.181.10.
Authority
integral.net. 172800 NS ns-1208.awsdns-23.org.
integral.net. 172800 NS ns-1631.awsdns-11.co.uk.
integral.net. 172800 NS ns-436.awsdns-54.com.
integral.net. 172800 NS ns-542.awsdns-03.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0