What's a UIN?

UIN stands for Universal Internet Number. It is the number given to you by the ICQ server when you register to the ICQ Network.

The number can be found at the top of your ICQ contact list (the title bar).

The number in this example is 11952102 (I'm using my UIN as an example). Check your ICQ Window to find out what your UIN is.
If you have not yet installed ICQ you do not yet have a UIN.

If you cannot open ICQ for whatever reason, you can check it another way:

  • Open Windows Explorer
  • Go to C:\Program Files\ICQ\uin
The number should be listed here as the first part of the filename.
11952102.uin
If there is more than one number, open Notepad and open each file until you find the one that corresponds to your ICQ account.