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.
There is a training manual at Delphi Superpage:
http://sunsite.icm.edu.pl/delphi/
Also try:
http://www.drbob42.com/Delphi/ for article on specific topic