How did I get your IP Address.
I get asked this a bit, so I created this Response, Enjoy
First I'll assume that given you're asking me this, you don't really understand how the Internet works
(if you did, you wouldn't be asking this question)
Primer on Internet Communication
How Does the Internet Work?
HowStuffWorks "How Internet Infrastructure Works"
Hypertext Transfer Protocol - Wikipedia, the free encyclopedia
Now I'm guessing you're asking about this image
http://www.pgp-protector.com/tracking/track.jpg
You'll notice that this image is called via the WWW and the Hyper Text Transfer Protocol
(See Previous Links)
When your computer ask for information via the Web, it sends a Request Message, this sends a bunch of information to the Server, including what you're requesting (
http://www.pgp-protector.com/tracking/track.jpg), and what IP address to send the request to.
Most browsers will give quite a bit of info every time you request anything, including IP Address, Host Name, User-Agent(Browser), Port, Proxy IP Addresses, Operating System, If .NET is Enabled, Languages Supported.
Next what happens is the server that my image is running on will take the Request that You gave it along with the info you gave it, it then creates a custom image that Only you will see and then sends that image that you requested back to you.
So if you were to go to another computer with a different IP address / Provider, you would then see that IP address not the one that you saw earlier.