wts, I'm not sure what you mean, but there's already a list of that in-game. Simply go to multiplayer, and switch from Local (Or whatever it is) to Internet, then refresh/get new list, you should see them there. Also, the ioquake3 engine (
That Open Arena uses) has command history, so if you typed
/connect barney.pbs.org, quit the game, next time you go in, go to command line, and press the
UP arrow key and it should come up. More information on the console
here, everything applies to Open Arena except the 'Console Spice' section, that can get you more acquainted with the console.