External IP Address Assigning To Computer

External and local IP addresses both serve the same purpose.  An external or public IP address is used across the Internet in locating computer systems and devices. A local or internal IP address is used in a private network to locate the computers and devices connected to the LAN (Local Area Network).

Your ISP will assign an external IP address when you connect to the Internet. It follows a process; when your web browser requests a webpage, it sends this IP address along with it.  To clarify, any website that you visit will have access to this IP address.

On another note from the standpoint of a website, a Domain Name Server (DNS) looks up the IP address for you, which is the real location of the website.

So, basically stated, an external IP address is accessing the public Internet via your router, whereas the internal IP address is specific to your home network.

Following outlines how your computer is assigned an external IP address

With command prompt for Windows 2000, XP, and 2003:

1. Select Start
2. Select Run
3. Type in 'cmd' and hit Okay
4. Type 'ipconfig' and hit Enter

With command prompt for Vista:

1. Select Start
2. Select All Programs expand the Accessories menu
3. In the Accessories menu, right-click Command Prompt and choose Run as administrator
4. Type 'ipconfig' and hit Enter

Without command prompt for Windows 2000, XP, and 2003:

1. Select Start
2. Right-click My Network Places
3. Select Properties
4. Wired Connection: Double-click Local Area Connection and click the Support tab, then click Details and the window that appears will display the IP address. Wireless connection:  Double-click Wireless Network Connection and click the Support tab, then click Details and the window that appears will display the IP address.

Without command prompt for Vista:

1. Select Start
2. Right-click Network
3. Select Properties, opening Network and Sharing Center
4. Wired Connection: click View Status to the right of Local Area Connection and click Details, then look for the address next to "IPv4 IP Address”. Wireless connection:  click View Status to the right of Wireless Network Connection and click Details then look for the address next to "IPv4 IP Address."

With command prompt on Mac platform:

1. Open Finder
2. Applications and select Utilities
3. Launch Terminal
4. When Terminal has launched, type the following command: ipconfig getifaddr en0 (to find your IP address if you are connected to a wireless network) or ipconfig getifaddr en1 (if you are connected to an Ethernet).

Without command prompt on Mac platform:

1. Select System Preferences from Apple menu
2. Select Network from the View menu
3. Select network port (e.g., Ethernet, Airport, Wi-Fi) based on your connection, you'll see its IP address under "Status."

Results

If you see an IP that resembles 192.168.n.n, then this is an internal IP address assigned by a router. So your router is getting your external IP address.  Above all, if the IP displayed in the command prompt window matches the one shown on What Is My IP, then your computer has assigned the external IP address.

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