title: example.com is OK for domain example, what is example IP Address?
body: <p>We use the example.com often for domain name reference. I wonder if any IP address used as an example IP address to mention in references like tutorial or notes?. I knew the loop back interface 127.0.0.1 can be used but it has been known for local system always.</p>
  
  <p>Can example.com IP Address used for this purpose legally?</p>