Here are the TCP/Web100 Network Diagnostic Tool Locations:
Web100 Network Diagnostic Tool  (NDT)
 

University of California - Santa Cruz, CA
http://nitro.ucsc.edu/

Stanford University - Palo Alto, CA
http://netspeed.stanford.edu/

Argonne National Laboratory, Argonne, Illinois
http://miranda.ctd.anl.gov:7123/

University of Michigan - Flint, MI
http://speedtest.umflint.edu/

Rochester Institute of Technology - Rochester, NY
http://web100.rit.edu:7123/

Thomas Jefferson National Accelerator Facility - VA
http://jlab4.jlab.org:7123/

National Science Foundation - VA
http://ciseweb100.cise-nsf.gov:7123/