How do I get the external IP of my server using PHP?

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There is NO way to get your underlying IP Address that has been designated by your ISP via conventional PHP if you are using a router. A way to get the external IP is to find a service that will obtain it for you and echo the address back to you. I found a handy service which does just that. http://ipecho.net/

You can use:

$realIP = file_get_contents("http://ipecho.net/plain");

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