JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cloud.github.com/downloads/digitalBush/jquery.maskedinput/jquery.maskedinput-1.3.min.js"></script>
<input type="text" placeholder="xxx.xxx.xxx.xxx" />

CSS

input {
    font-family: Courier
}

JavaScript

jQuery(function($){
   $("input").mask("9?99.9?99.9?99.9?99", {placeholder:" "});
});