It's magic! ;-) All kidding aside, that's not really how our proxies work. You can find the technical explanation in this image:

So basically you connect to our access server which forwards your request to your unique final IPs. The IP you see if the IP of the access server.

Wether you use a unique IP and static port (say, 80 or 8080 which are common), or a static IP and dynamic ports (like with us), it's the outgoing address that counts.

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