There are several sources of potential landmarks. These include PingER, perfSONAR and PlanetLabs.
perfSONAR
Use the perfSONAR list of traceroute/ping servers. It is at: http://132.160.6.186/toolkit/gui/perfAdmin/directory.cgi#PING. This provide a list of IP names/address that host traceroute/ping servers. Then add to the perfSONAR toolkit host name (e.g. 192.41.236.35 or 2001:e10:3c00:3:5054:ff:fe12:ee41) the following
<perfsonar-toolkit-host>/toolkit/gui/reverse_traceroute.cgi?target=<target>&function=ping
to create a URL: http://192.41.236.35/toolkit/gui/reverse_traceroute.cgi?target=www.upenn.edu&function=ping. The output should appear as below:
PingER
Most PingER monitoring sites have a traceroute/ping server. This is the same server CGI script (with a different URL) as the perfSONAR server CGI script so the output is the same. The URL for the PingER ping server is
<pinger-host>/cgi-bin/traceroute.pl?target=<target>.edu&function=ping
This creates a URL of the form http://pinger.arn.dz/cgi-bin/traceroute.pl?target=www.slac.stanford.edu&function=ping