//A DNS, or domain name system, is a system for naming computers, services and other devices on the Internet. Domain name systems translate domain addresses, which people associate with a certain website or service, like Google.com, with an actual IP address number, which computers can more easily use. If you plan to modify or configure your Internet connection, you may need to look up your DNS number.//
http://www.ehow.com/how_5085465_dns-number.html
An Internet Protocol address (IP address) is a numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication.
http://www.ehow.com/how_4732016_ip-address.html
Every device in your home that is connected to the net has a different ip address taichi