Determine you're outbound (http) IP and reverse DNS

myip

#!/usr/bin/env bash
# Depends on curl and dig

TIMEOUT=1
SERVER=4.2.2.3

IP=`curl -s --connect-timeout "$TIMEOUT" https://outboundip.com 2>/dev/null`
#echo :$?:


if [ ! X$IP == "X" ]; then
        PI=`dig -x $IP @$SERVER +short`
        if [ ! "X$PI" == "X" ]; then
                echo "IP=$IP; PTR=$PI"
            else
                echo "IP=$IP"
        fi
    else
        echo "null"
        exit 1
fi