Your friend is having a hard time studying TCP/IP addressing for the exam. Pick one of your favorite websites and find its IP address (you can open the command prompt in your computer and ping the website URL to get the IP address), then analyze the IP address. You need to find the class of the IP address, the subnet mask, the network ID and the host ID of that address. If you don't know how to ping a website, ask your instructor or one of your classmates, or even better, research on the web and find out how yourself. After all, we're here to learn.