To use the program to test the available bandwidth between two locations, you will need to install it on two systems at those locations - perhaps you could install it on a system at a friend's or relative's house if you don't have two systems of your own at separate locations or you could test from a phone or laptop to another system at your home location while outside of your home, if that is the location whose bandwidth you wish to test. It is command line program available for Microsoft Windows, Apple OS X, Linux systems, as well as iPhones and Android phones - see the download links at If there is more congestion on the path, your speed test results may be lower than when you previously ran a test.Īs far as running a program on your computer to judge the available speed to a system outside of your local area network (LAN), Iperf is frequently used to test the available bandwidth between two systems. You are unlikely to get exactly the same results even if you run several tests using the same Internet speed test provider, since there will be other traffic between you and the provider's test server and that traffic will vary from moment to moment. You can see the number of intervening routers, i.e., "network hops", between two systems by using the traceroute command on Microsoft Windows systems it is tracert, e.g., tracert You may notice that the number of network hops varies even when running a test with the same provider from one day to the next, since the way networking works is that if one network path becomes unavailable or congested, another, if available, may be taken, just as you might choose a different route to drive from point A to point B if you know there is a congestion on a particular road between the two points. E.g., as an example of different results, you can see the bandwidth test results I found several years ago when testing a Verizon network service using the above test services, including tests run using the same test provider, but at different times or with servers in different cities for a bandwidth test provider. You shouldn't expect to get exactly the same results between speed test providers, since the number of network hops between your systems and their servers will vary, i.e., there will be a varying number of routers between your systems and their systems depending on the network path between your systems and their systems. The test ends at the predetermined time, and the client presents your current upload bandwidth in megabits per second.Sites that I've used for such testing in the past include the following: The upload test works in reverse: the client sends test data to the server and takes measurements. The test ends at the predetermined time, and the client presents your current download bandwidth in megabits per second. As the client downloads this data, it measures the speed and makes adjustments as necessary-like opening more threads and requesting more data-to maximize the full bandwidth of your internet connection. Next, the client establishes multiple connections (called threads) to the remote server and requests test data. The test ends, and the client presents the lowest roundtrip measurement in milliseconds. The client records the amount of time the exchange used and then repeats the test a few more times. It then sends a tiny bit of data to the remote server, which sends a bit of data back to the client. How does the Spectrum Internet ® speed test work?įirst, the test client on your device determines your location and finds the closest server.
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