How to randomize X-Forwarded-For?

[WAZAAAAA]

I realized that I've asked this in the wrong section so I will repost it here:

What the title says.
I started using Proxomitron, it's cool and all but it would be even better if I knew how to randomize stuff with it.

How do I make a random string like this for the X-Forwarded-For:
*random number between 1-255*(dot)*random number between 1-255*(dot)*random number between 1-255*(dot)*random number between 1-255*

Just trying to get a fake proxy running that can fool some automated systems and people... you know, real ones slow you down, and call me paranoid, but I'm afraid that the proxy hosters can abuse them to get your passwords and such.
just some tags to make this easier to Google - how to tutorial guide howto tut random randomizer rand randomization numbers fake faker IP Address HTTP header proxy generator generate generation X_FORWARDED_FOR