For years now, people have been asking me how many Drupal sites there are. This is, of course, something of a moving target and I figured that the only way to answer that question was to count all the Drupal sites out there one by one. Three years ago, I was finally motivated enough to write a Drupal site crawler that looks over the millions of websites online to find those powered by Drupal. The crawler initially ran for about 3 months, and it returned a lot of Drupal sites. For each one it found, I then did some data-mining to extract the location of their hosting servers.