title: Random unique number like IP address mysql
body: <p>I'm making an android game which is made with a hacking theme, and I want to generate a random and unique IP address-style user ID (example xxx.xxx.xx.xx)</p>
  
  <p>At the moment I know how to generate a unique ID, but it is just incremented from 1 and up.</p>
  
  <p>I don't know if it is maybe only possible through php?
  Or even the android app's side?</p>
  
  <p>Any help would be greatly appreciated!</p>