In this article we learn about the sub-network address and how to find out the sub-network address from the given IP address and mask address. Sub network address is the address, which is depends upon the IP address and what class is used in IP address. Class of IP address may be the A, B, C. In organization we need to use sub-netting. In sub-netting IP address is split into the many sub-network address. Sub-netting allows us to split network address into several parts of internal use. If we done sub-netting then outside world only see the single network address …