On the recordRead 15 Oct 202637 facts
iperf2
Plans and prices
Professional edition
Free
permit-key access gating · server-side latency histograms · UDP L4S · source and build available at no cost
Read 15 Oct 2026 · iperf2.sourceforge.io
On the record
- API and SDKs
- The published developer interface is the command-line program and its documented options; no separate REST API or SDK is described on the project pages.iperf2.sourceforge.io · read 15 Oct 2026
- Company and maintainer
- Robert (Bob) McMahon is identified as the creator and maintainer of iperf2 and as founder and CTO of Umber Networks.linkedin.com · read 15 Oct 2026
- Development history
- The iperf3 FAQ states that McMahon restarted iperf2 development in 2014 after the original project had been orphaned, adding fixes and features while retaining broad platform support.github.com · read 15 Oct 2026
- Documentation depth
- The project publishes a user manual, a man page, installation instructions, option reference, examples, diagnostics and bug-reporting guidance.iperf2.sourceforge.io · read 15 Oct 2026
- Enhanced metrics
- Enhanced reporting can expose RTT, congestion window, retries, packets per second and latency-related values.sourceforge.net · read 15 Oct 2026
- Extensibility
- The source includes a Python asyncio flows framework and compile-time configure flags for professional features, fast sampling and diagnostics.iperf2.sourceforge.io · read 15 Oct 2026
- Independent packaging
- Homebrew provides a brew install iperf formula, identifies the software as a TCP/UDP bandwidth tool and lists BSD-3-Clause licensing with macOS and Linux bottles.formulae.brew.sh · read 15 Oct 2026
- Installation
- Source builds use GNU Autotools with ./configure, make and sudo make install; distributions commonly package it as iperf.iperf2.sourceforge.io · read 15 Oct 2026
- Interoperability limit
- iperf2 and iperf3 are independent implementations and do not interoperate at the protocol level.iperf2.sourceforge.io · read 15 Oct 2026
- Latency and jitter
- It measures latency, including one-way delay and round-trip time, together with UDP jitter.iperf2.sourceforge.io · read 15 Oct 2026
- License
- Debian's copyright record identifies the main iperf source and Broadcom-contributed files as BSD-3-clause licensed.sources.debian.org · read 15 Oct 2026
- Limit: Android availability
- AppBrain records the older Kaushik Battu Android app as unpublished from Google Play on February 6, 2025.appbrain.com · read 15 Oct 2026
- Limit: Android usability complaints
- AppBrain comments report missing one-click client/server setup, options requiring an app restart, IPv6 display and detection problems, and commands that did not work for some users.appbrain.com · read 15 Oct 2026
- Limit: long-run crash history
- A Debian bug report records iperf2 crashing during long tests on 40Gb/s NICs in version 2.0.10, with the issue fixed in 2.0.12.bugs.debian.org · read 15 Oct 2026
- Limit: UDP throughput variance
- A GitHub issue reports iperf2 UDP throughput around 557 Mbps where iperf3 reached roughly 900 Mbps in the same test setup.github.com · read 15 Oct 2026
- Limit: Windows UDP server bug
- An open SourceForge ticket reports that a persistent Windows UDP server can stop returning acknowledgements after the first client disconnects.sourceforge.net · read 15 Oct 2026
- Multicast and IP versions
- The implementation supports multicast including source-specific multicast, plus IPv4 and IPv6.iperf2.sourceforge.io · read 15 Oct 2026
- Output formats
- The command line can produce human-readable reports and CSV output; JSON output is not listed for iperf2.iperf2.sourceforge.io · read 15 Oct 2026
