title: IP to world region
body: <p>Is there an easy way to detect user region using IP address? I'd assume that each region will have a specific IPv4 range assigned.</p>
  
  <ul>
  <li>I don't want to rely on any 3rd party service (except initial data import) </li>
  <li>Precision does not need to be 100%, but should be reasonably high (at least ~80%)</li>
  <li>I only want to guess users region (Europe, Asia, Africa, ...). No need for city/country.</li>
  </ul>