I recently set up a server that I want to use as my primary hosting platform. So far, I've mapped some domains to it by setting up A records for them that point to my dynamic IP. As my IP can change randomly and without notice, however, I'm afraid of such downtime. Thus, I'm looking for a dynamic DNS solution.
So far, I've set up DynDNS, but I haven't found a way to use dynamic DNS with an existing domain. Are there any free dynamic DNS nameserver services available?