Verizon's Internet speed test is available through the My.Verizon.com website as of 2015. This speed test is provided by the third-party speed test company Ookla and measures both the upload and download speed of an Internet connection.
The Verizon speed test is best run when a computer is directly connected to a modem and not via Wi-Fi or a wired router. This ensures that the speed measured is not artificially lowered by local network conditions. Additionally, the speed test may give different results depending on the time of day due to network congestion issues. Other things that can affect the speed test include how many computers are connected to the modem, the quality of your cable wiring and how many programs are running on the computer at the same time.