Trace Explorer

Trace Explorer aggregates traceroutes to hundreds of thousands of popular websites and makes the result searchable, allowing you to discover which web sites are hosted near each other, at a particular ISP, or behind a specific router.

To get started, type in the domain name of a web site or ISP:

Tips

By default, you'll only see hosts or routers that exactly match your query and anything beyond them. If you want to see what else is near by, try clicking on the IP address of the router just before your destination.
To compare the paths to multiple destinations, just type in both, as in [perl.org cpan.org].
To remove something from the results, prefix it with a minus, as in [perl.org cpan.org -cogentco.com], which will find *.perl.org sites that are not on Cogent.
For a quick trace of any page you are viewing, bookmark this link -> Trace Explorer <- by right-clicking on the link and selecting "Add bookmark for link" or dragging it to your browser toolbar.
Only around 1000 results will be returned. If your query is very broad, you may get no results or will see what exactly matches your query but not very far beyond that. If you run into this, try to be more specific.
This tool has already collected traces to many popular web sites within the last two weeks. In addition to searching through recently-collected data, if you type in a hostname it doesn't know about, it will collect the data while you wait and add that to its results.

Example Queries

[berkeley.edu] - What's hosted at berkeley.edu?
[18.0.0.0/8] - What's hosted within MIT's 18.0.0.0/8 address space?
[mcdonalds] - Hostnames containing the word "mcdonalds"?
[pnap.net rtt:8] - What's on Internap's network within 8ms of Cyberverse?
[wdc*.dsl.speakeasy.net] - Who hosts their web sites on Speakeasy DSL, in Washington, DC?

You may be interested in how this works, including limitations on its accuracy and completeness.