Different C Blocks for free on DreamHost
For DreamHost users, you might be surprised to know not all your domains on your account will necessarily be on the same c block. This is all dependent on the timing of when you add your domains to their system. If you add several domains all on the same day, your chances of them all being on the same c block are increased. However, if you wait a day or more between adding them, you *might* end up on different c blocks.