On the 28th of last month (2013/06/28) I lost my subdomain name that I had previously been getting for Dyn for free. For a long time Dyn offered free dynamic DNS. I setup my subdomain with them on their homelinux.org. This was initially needed because the server was being run from my, well, home. This provided a convenient method to automatically update the DNS records when my IP would change. This worked well, and it worked well for a long time.