General info about
davespeed traceroute

Traceroute is a very important and useful tool for observing and diagnosing network behavior. It can show you the route data packets are taking across a network, and how well they're making the trip, by, in effect, incrementally pinging each successive hop.

Your computer probably came with a traceroute (or tracert) command, and you can use it any time to see how well your packets are making the trip to whatever destination you specify. Typically this target destination can be provided as either a machine/domain name or as an IP address. Examples include: smtp.whitehouse.gov, cnn.com, ec2-44-192-22-242.compute-1.amazonaws.com, and 216.157.66.143

By using a gateway to someone else's traceroute, you can see how well packets are making the trip from that person's server to you (which is usually a different route than the one your packets of data take to reach it!), or whatever destination you provide.

Also, you can use such gateways to establish that your web site is reachable from other locations if you suspect a "can't get there from here" condition may exist for some geographical areas. This is also a handy way to check another server's DNS when your ISP's is suspect, such as when changing web hosts and some users are finding the new host while others are still being pointed to the old host.

So it's a nice thing for 'netizens to set up traceroute gateways, and there are hundreds -- maybe thousands -- of them. I wanted mine to be the nicest one on the internet, so it has a few extra bells and whistles not (yet!) found on most (any?) others:

More information on traceroute: