What is homedns?:

     Homedns is like a homemade dns system. What I mean by homemade is that
     it is not ran by some big name server such as an ISP, but ran by people
     that happen to have a webserver and run linux as their o/s.
     There are two parts to this program, a perl script and a C client.
     The perl script resides in the root directory of an http server, which
     you can easily get for free. The perl script keeps IPs of users and a
     database of all the usernames and passwords of registered people
     the client program communicates with the perl script to create accounts,
     update IP, grab IPs, etc.. Everyones IP who is registered will have their
     IP on the server, so if you wanted to grab their IP you would use the
     client with their username, it will then get their IP and edit /etc/hosts
     and insert their "username"dns inside the /etc/hosts with their IP.
     Now you can just do like ytalk@usernamedns to talk to them.

  Why would i want this?:

     Well, name servers take a while to update, if it says your IP is updated
     on your name servers, it might not be the same on your friends name servers.
     Since this keeps a database on a server that everyone can access, getting
     their IP is quick and simple.

    Visit brained to see where I come from.