IP locator websites..?

[Hack3rzGod]

That's quite easy, there is basically use of Javascript or PHP or you can use both to print out all of the user's Info.
There are a lot of predefined functions in javascript and php that prints all of the info you can use these to make a custom IP locator script.

i can a lot of users posting the codes for that, grab it and have fun!

i would suggest you learn Javascript and PHP if you don't understand the codes.