title: Obtain client's MAC address using Node js
body: <p>I'm working on a project that will allow my home automation identify who is at home by using their MAC addresses as an identifier.</p>
  
  <p>I've tried to obtain the MAC address of a client on my own network using Nodejs and the NPM module 'arped'</p>
  
  <pre><code>var arped = require('arped');
  
  console.log(arped.table());
  </code></pre>
  
  <p>It reads the ARP tables though it only outputs a handfull of IPs/MACs. Is there something that I'm missing about ARPs or what?</p>
  
  <p>The output is showing my router, my chromecast, my windows laptop and my iPhone 4. It's not showing another windows laptop and an iPhone SE.</p>