Any Internet Service Provider (ISP) or Datacenter (IDC) that have their own networks and infrestruturas.
Will be necessary to validate the information on activation.
The tools are executed from remote locations.
The PING tool for example ... you'll see listed some remote locations.
You can choose one of these remote locations and conduct your test from a chosen point.
Participation is precisely this be one of the remote test points.
The more the project participants have, the better is the tool.