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well if your on a windows machine you can get your local lan ip by going into the command prompt and entering in "ipconfig" without the quotes... and it'll give you your address
though if your looking for a php function or something that will get someone elses lan ip I'm not sure you can do that.
not quite sure if this is what you are trying to get at, but ....
if you mean you are running the server and browser on the same machine, and you want to get the real IP address of the browser, when you enter the url dont use 127.0.0.1 or localhost use your actual 192.x.x.x IP address. That should return the address you are looking for.