To find out your IP address. SEE YOUR IP ADDRESS

A little bit about your IP address (Internet Protocol address). When you connect to the internet, either via your internet service provider (Verizon, Cable Vision, etc.), or your office LAN connection, you are assigned an IP address. This address identifies your computer from the other computers on the internet. Your IP address can be either static, meaning it never changes, or dynamic, meaning each time you connect online you are assigned a new address for that session. Check with your internet service provider or network administrator to find out if your computer uses static or dynamic IP addressing.

The commands below will show you the IP address of your computer. If you use a home router to connect to the Internet, the IP shown from these commands will not be your public IP address (it will be your internal IP address). Internal usually IP address start with a 10.10 or 192.168.

Windows 2000, XP:
Start/Run:
Enter in the command: cmd
At the command prompt enter in: ipconfig

Vista, WIndows 7:
Go to the command prompt by select the Windows logo and in the search box entering:
cmd
From the command prompt enter in the command: ipconfig

On Windows XP, Vista, Windows 7, if you'd like to know your MAC address (physical hardware address of a your network card), at the command prompt you can enter the following command:
getmac -v

On Mac OS X:
1. Click on the Mac logo on the top left of the screen.
2. Open System Preferences
3. Under Internet and Network, click 'Network'
4. Select which adapter, such as AirPort or Ethernet.
5. Select TCP/IP and you'll see your IP address.. If you receive a dynamic IP address from your internet provider, it will likely be different on your next session. So if you need your IP address for later use, please check when you log on for that session.

Sumber daripada : http://www.lawrencegoetz.com/programs/ipinfo/