title: Auto Fill Text field from one text field to another with small change
body: <p>Is there anyway to auto populate fields based on user input from the 1 text field, then update rest of the fields with small changes in each field. </p>
  
  <p>For example:</p>
  
  <pre><code>[user input] Field 1 Network: 192.168.0.0 
  [auto] Field 2 Network_Util: 192.168.1.0
  [auto] Field 3 Network_Util2: 192.168.2.0
  </code></pre>
  
  <p>I tried to for following code, but it copies the text, how to change the third octet value?</p>
  
  <pre><code>&lt;input type="text"id="network1" name="Network1" value="" &gt;
  &lt;input type="text" id="network2" name="Network2" value=""&gt;
  
  $("#network1").keyup(function(){
      var net = network1.split(".");
      var octet3 = net[2];
      $("#network2").val(this.value);
  });
  
  </code></pre>
  
  <p>Thank you for your help</p>