title: How to prevent restrict access to a web application to authorized devices only?
body: <p>I have developed an MVC web app. Right now, the client using this app in office area. The client has requested that no one should use this app on any device except the office's PC/tablets.</p>
  
  <p>Now problem is, it's a web app, so how can I put restrictions that nobody can use this app from the outside of the office or with devices other with than office's PC/Tablets?</p>