iperf3

iperf3 is a modern, open-source tool for measuring TCP, UDP, and SCTP network bandwidth performance. It is widely used for testing network throughput, diagnosing bottlenecks, and benchmarking connections between two hosts.

It is especially useful when:

  • You need accurate measurements of maximum achievable network bandwidth
  • You want to compare TCP vs UDP performance
  • You are troubleshooting network latency or jitter issues
  • You need a command-line tool for automated network testing

iperf3 is developed by ESnet and distributed under the BSD license. It supports multiple operating systems, including Linux, macOS, and Windows (via third-party builds).

Download Options

Platform Type Download
3.19.1 Linux x86_64 Tarball (.tar.gz) Download

Useful Links