Iperf 2

Throughput testing, latency testing, jitter measurement, packet loss measurement, TCP testing, UDP testing, ECN testing, L4S testing, responsiveness testing, bounceback testing, one-way delay measurement, histogram reporting, multicast testing, IPv6 support, parallel streams, bidirectional testing, full-duplex testing, congestion-control testing, socket pacing, CSV output, embedded systems support

Current release: 2.2.2, July 7, 2026

About iperf 2 and iperf3: Read about the differences between these programs at https://iperf2.sourceforge.io/IperfCompare.html

Man page: https://iperf2.sourceforge.io/iperf-manpage.html

Manual: https://iperf2.sourceforge.io/iperf2-user-manual.html

Features

Throughput testing
Latency and jitter measurement
TCP and UDP performance testing
Packet loss and ECN measurement
Enhanced reporting with RTT, CWND, retries, PPS, and latency metrics
Parallel streams, bidirectional tests, reverse tests, and full-duplex testing
Responsiveness testing with TCP bounceback and latency histograms
One-way delay and trip-time measurement
Multicast, source-specific multicast, IPv4, and IPv6 support
Portable builds for Linux, Windows, macOS, Android, embedded systems, and set-top boxes
See the man page and user manual for more

Project Samples

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Additional Project Details

Registered

2014-02-06

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