Just wrote this up in a few minutes. Don't expect much, I'm just demonstrating the usefulness of having an IP resolving feature in a program rather than using the command prompt. I didn't add in any exceptions so it'll crash if you try to use a letter for a port number, for example. Too lazy. =p
I might actually turn this in to something bigger when I get bored. We'll see I guess.
Edit-
Added a couple more tools, getting the local IP address of the system and a netstat tool.
I would also, if you don't mind, use the source once posted. I'm just in the middle of writing a program to run at my new school since they've blocked the console window.