So my customer wants more users – like MANY more hundreds of users, so i need more than 200 that a 192.168.1.0 network would give. Here are some great planning tools. This is all being done with pfsense on a soekris hardware box.
http://tuxgraphics.org/toolbox/network_address_calculator_add.html for ip planning. It tells you the starting and finishing addresses.
understanding netmasks: http://www.rhyshaden.com/ipadd.htm