Anyway to block reverse DNS lookup which reveals the geographic are such as on ShieldsUP, as I thought that routers were capable of doing this?

Those sites aren't doing a reverse DNS lookup. They are merely associating your IP address with a geographic region using a lookup table. You would have to go through a proxy in order to hide your IP address. FYI: A reverse DNS lookup takes an IP address and determines the domain name associated with it. Michael J

Is it possible to use your router as a proxy in order to hide your IP address?

no, its not possible. some wireless routers allow you to bridge another wifi connection into your router but other then that you really cant. your internet connection allways equals your IP address. they have many free proxy applications you can run locally off the host machine... google "tor park".

Well, in a sense, your router is acting as a proxy. The IP address that the sites receive is the IP address of your router, not your machine. Your machine has an internal IP address - probably something like 192.168.x.x. But, your router will have the IP address that your ISP assigns to you. Unless you are able to run through a proxy that has an entirely different IP address then you are out of luck. To be honest, I'n not sure what your concern is. As long as you aren't doing something shady what's the problem. The fact that a site has an approximate idea of where it's visitors live is not a bad thing. It let's them tailor their site to their visitors. They have no way of linking your IP to you unless they get it from your ISP - and that usually takes a court order (at least in the US). Michael J