fast

Run speed test

$ fast

$ fast --upload

$ fast --single

$ fast --json

fast [options]

fast is a command-line speed testing tool powered by Netflix's Fast.com service. It measures download speed and optionally upload speed using Netflix's servers worldwide.
The tool provides a quick bandwidth measurement without ads or complexity. It's useful for testing internet connection quality and ISP performance.

--upload

Include upload speed test.

Run single download test (not parallel).

Output results in JSON.

Save test data to file.

Requires internet connection to Netflix's servers. Results may vary by location and time. Netflix servers may be throttled by some ISPs. For more detailed tests, use speedtest-cli.

fast-cli was created as a command-line interface to Netflix's Fast.com, which Netflix launched in 2016 as a simple, ad-free speed test. The service uses Netflix's content delivery network.

speedtest-cli(1), iperf(1), curl(1)