To keep all of the laptops on the Internet straight, each laptop is assigned a unique address called an IP address. IP stands for Internet protocol, and these addresses are 32-bit numbers normally expressed as four “octets” in a “dotted decimal number.” A typical IP address looks like this:
216.163.103.190
The four numbers in an IP address are called octets because they can have values between 0 and 255 (28 possibilities per octet).
Every laptop on the Internet has its own IP address. A server has a static IP address that does not change very often. A home laptop that is dialing up through a modem often has an IP when you dial in. That IP address is unique for your session and may be different the next time you dial in. In this way, an ISP only needs one IP address for each modem it supports, rather than for every customer.
If you are working on a Windows XP , you can view your current IP address with the command WINIPCFG.EXE (IPCONFIG.EXE for Windows 2000/XP). On a UNIX laptop, type nslookup along with a laptop name (such as ” www.ezinedomain.com”) to display the IP address of the Domain (use the command hostname to learn the name of your PC).
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