For those of you who have never heard of it, No-IP is a service that allows you to resolve your IP address into an easy-to-remember URL. For those running servers, this can be very useful, since you can give your users a link like:
which is far easier to remember, and if your external IP is a dynamic one, you don't have to worry about telling everyone what it is every time it changes.
obviously you can put whatever you want in the first bit where I put semperverus-minecraft, and the middle bit is also changeable from a pre-set number of options (my favorite choice is "sytes"). For me, my actual No-IP is
When you go to the No-IP site, at the top, click "Hosts/Redirects" (in the green bar) once you've registered an account.
Then click "manage hosts" in the left panel if it hasn't already taken you there.
Click the orange "add a host" button on the right side, and it'll take you through the setup process.
On the lefthand side, select "download client". There's one for every major OS (Windows, Linux, and *cringe* Mac)
Install it, log into it, and set it up to auto-start on your server's startup. The program is very lightweight, so you don't have to worry about resource hogging. It's basically a slightly more advanced "ping" command that communicates with the no-ip servers.
Oh btw, this is free to use, and you can have up to 5 no-ip addresses!
Also, you can type said no-ip addresses into the minecraft multiplayer server IP section.