Because remembering an IP address is hard.
I’ve mentioned before that I have a private Voxelands server running so that the boys can build and explore in the same world. This works pretty well but it does mean that, as can happen, one of them connects to the wrong server I have to go and look up the IP address so that I can reconnect them.
And then I discovered FreeDNS which, as the name suggests, allows you to set up a subdomain for free. You sign up, select a public domain from the extensive list available, add a subdomain, and point it at your IP address.
It really is as simple and as quick as that.
I’m impressed at how simple and painless they have managed to make the whole process. So much so that, if I do find myself needing a premium service, I will be very happy to go back to them.