There are 3 possible reasons why test speeds that greatly exceed the line capacity may appear in the DSLReports Speed Test database:
•They may have been using an ISP proxy server. If that is the case, the speed test results are not accurate at all. When the speed test is run from a PC that is using a proxy server, it is the speed between the test server and the proxy, not between the test server and the end user that is actually reported. Most proxy servers are on a very high speed backbone connection.
•The speed was tested while using some other high speed access line (work, friends cable modem, etc). Speeds are logged to the ISP listed in your DSLReports member profile by default.
•The results were faked. This is very possible and is one of the most common reasons for inflated speeds.