WHAT IS DYNAMIC DNS? Dynamic DNS is basically an answer to someone who always wants 'xyz.com' to map to a changing IP address. Since there are a limited number of IP addresses available, many providers will assign their dialup, ISDN, DSL and cable subscribers an IP address taken from a pool of addresses that will only be assigned to them for the duration of their session. If your session is dropped or you reset your connection, you have a chance of losing your IP assignment. By using dynamic updates, you can tell SDF your new IP address as soon as you are assigned one and SDF will begin resolving your MDNS hostname to your IP. The default for mdns and currently what we offer our users is: login.mdns.org - where login is your username. You can run whatever services you wish to run on your host, keeping in mind that you are bound not by SDF's AUP, but rather, your ISP's AUP.