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.
<%
String mainpage = request.getParameter("main
if ( mainpage==null )
mainpage = "default.jsp";
%>
...
<FRAME name="main" src="<%=mainpage%>" >