The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.
One of a set of tools we're offering as a way of saying thank you for being a part of the community.
Do the following (temporarily) in order to test this scenario:
$ xhost +
$ netscape &
If Netscape starts up, you've got an X permissions problem. Please run "xhost -" after this test. You may wish to read the man pages on "xauth" if you want two users to have access to your display. If netscape is being run on another machine with the display coming back to your machine, it will need a copy of your .Xauthority file in order to connect.