What information about the computer can a browser send to a web server?


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What hardware information about your PC's can gathered by websites/ISP's?

I'm very curious about the limitations of the a capabilities of a browser to send the details of a computer's hardware and software details.

Here are some details point that I know about.

  • OS, Browser type, user IP address, Resolution of the display

Some people say some sites can have the computer's network interface mac addresses. (like google adsense)

Best Answer

Let me preface by saying that I work for a company that identifies devices based on things that can be observed in the browser.

Nobody (short of exploiting a security vulnerability) can get your mac address (EDIT: Unless you run native code from them e.g. as a plugin).

For a good overview of what can be seen, have a look at EFF's Panopticlick:


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