An identifier for a computer or device on a TCP/IP network. Networks using the TCP/IP protocol route messages based on the IP address of the destination. The format of an IP address is a 32-bit numeric address written as four numbers separated by periods. Each number can be zero to 255. For example, 1.160.10.240 could be an IP address.
Finding out your own IP[edit]
Windows[edit]
ipconfig
Linux[edit]
ifconfig
Web-based[edit]
more details in IP.