How do I tell if I have a Private IP addresses? Private IP addresses will always start with:

10.x.x.x
172.16.x.x
192.168.x.x

Use these steps to find your computers IP address:

Windows

Windows 7, Vista, and XP, using the command prompt
1. Click Start, and then select All Programs.
Note: If this doesn't match what you see, refer to About navigation settings in Windows.

2. Click Accessories, and then Command Prompt.

3. At the command prompt, enter: ipconfig
The IP address (or IPv4 address, if you are using Windows 7 or Vista) will be a series of numbers following the pattern xxx.xxx.xxx.xxx (i.e., 128.163.1.123).

Windows 7, without using the command prompt
1. In the system tray, click the network connection icon and select Open Network and Sharing Center.

2. To view the IP address of a wired connection, click Local Area Connection.
To view the IP address of a wireless adapter, click Local Network Connection (Network Name).

3. Click Details... . Your IP address will appear next to "IPv4 Address".

Windows Vista, without using the command prompt
1. From the Start menu, right-click Network, and then select Properties. This opens the Network and Sharing Center.

2. To view the IP address of a wired connection, click View Status to the right of Local Area Connection.
To view the IP address of a wireless adapter, click View Status to the right of local Network Connection.

3. Click Details... . Look for the address next to "IPv4 IP Address".

Windows XP, without using the command prompt
1. From the Start menu, right-click My Network Places, and then click Properties.

2. To view the IP address of a wired connection, double-click Local Area Connection.
To view the IP address of a wireless adapter, double-click local Network Connection.

3. Click the Support tab, and then click Details... . The window that appears will display the IP address.

Mac OS X

To find the IP address of a Mac OS X computer:

OS X 10.5 and later
1. From the Apple menu, select System Preferences... . In System Preferences, from the View menu, select Network.

2. In the Network preference window, click a network port (e.g., Ethernet, AirPort, Wi-Fi). If you are connected, you'll see its IP address under "Status:".

OS X 10.4 or 10.3
1. From the Apple menu, select Location, and then Network Preferences... .

2. In the Network Preference window, next to "Show:", select Network Status. You'll see your network status and your IP address displayed.

Unix-like OS

In many Unix-like operating systems (e.g. Ubuntu, RHEL, OS X, BSD), a shared system administration utility known as ifconfig is available to configure, control, and query TCP/IP network interface parameters from a command line interface (CLI). Typically, ifconfig can only be used under a superuser account in your terminal.

To obtain your IP Address from ifconfig, enter the following command:

ifconfig
A list of all your network interfaces will appear. Following the heading of the interface whose IP address you're searching for, you will see a "inet addr:" section containing your IP address.

More information can usually be obtained through initiating the command:

man ifconfig

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