Worried that your Internet traffic is taking an unnecessarily circuitous path to you, ruining your performance (forcing you to wait too long when you request webpages, or causing "life" threatening lags in your favorite games)? Suspicious about what networks or countries might handle your traffic along its journey? Want to know if your provider is getting you the performance you are paying for? Just curious to see where data is coming from? For these questions and more, our new reverse traceroute system is just the tool you need! It allows you to measure the path from any destination back to you.

This webpage allows you to demo our new system. Select a test source from the drop-down list (perhaps the one nearest you), enter the destination of your choice, enter your email address (feel free to use a service like mailinator to preserve anonymity), and then launch the measurement. We will email you the result shortly. If you know the path (for instance, if you are testing using a "destination" that you control), we invite you to copy and paste the traceroute into the box below before you launch the measurement. This information will help us improve the system. Note that, if you enter a hostname (rather than IP address) for the destination, the resolution will happen at University of Washington and may yield a different address than it would at your location.