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.
http://support.microsoft.com/search/preview.aspx?scid=kb;en-us;Q235531
http://support.microsoft.com/search/preview.aspx?scid=kb;en-us;Q315676
http://support.microsoft.com/search/preview.aspx?scid=kb;en-us;Q294952