Measure and Test your internet connection speed for your Device, ADSL, Cable or mobile data.simple Internet speed test. How fast is your Internet connection? Sure, your Internet service provider has given you some numbers, and your cellular provider probably says you get blazing fast 4G LTE. But how fast is it, actually? There’s a good chance you’re not getting the Internet connection speed you’re paying for, but maybe you are. Here’s how to find out. One quick and easy way to test your internet speed is to use Ookla Speedtest, which is owned by PCMag's parent company, Ziff Davis. It measures the time it takes for data to transfer between your.