Check for changes in WAN ip using http://ifconfig.me

check-if-ip-changed.sh

#!/bin/bash
ip1="";
ip2="";
changed=0;
date1=$( date "+%s" )
while true; do
    ip1=$(curl -s ifconfig.me/ip);
    if [[ "$ip1" != "$ip2" ]]; then
        changed=$(( changed + 1 ));
        date2=$( date "+%s" )
        diff=$(( date2 - date1 ))
        echo "Changed IP: $ip1 | Changed Total: $changed | Time Change: $(( diff / 60 )) min. $(( diff % 60 )) sec. | Time: $( date "+%c" )";
        ip2=$ip1;
        date1=$date2
    fi
done;

Easy way to run this:

bash <(curl -s https://gist.githubusercontent.com/dukedylan/e81184266f529373413d/raw/81584e81bda28d4407e81e3f7ffb334bf168123c/check-if-ip-changed.sh)