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Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed. Find sources: "Iperf" – news · newspapers · books · scholar · JSTOR ( March 2020 ) ( Learn how and when to remove this message ) {{Cite web|url=https://sourceforge.net/projects/iperf2/files/|title=Iperf 2 – Browse Files |website= SourceForge.net }}</ref>"},"latest release date":{"wt":"{{start date|2024|11|06}}"},"operating system":{"wt":"[[Cross-platform]]"},"programming language":{"wt":"[[C (programming language)|C]]"},"license":{"wt":"[[BSD license]]"},"website":{"wt":"{{URL|sf.net/projects/iperf2/}}"},"repo":{"wt":"{{URL|sf.net/p/iperf2/code/}}"}},"i":0}}]}'> iperf2 Description of Iperf on TCP port 4662 under linux with an FTTH connection Original authors Mark Gates, Alex Warshavsky Developers Robert McMahon, Tim Auckland Stable release 2.2.1 [ 1 ] / November 6, 2024 ( 2024-11-06 ) Written in C Operating system Cross-platform License BSD license Website sf .net /projects /iperf2 / Repository sf .net /p /iperf2 /code / iperf3 Original author ESnet Stable release 3.18 / December 13, 2024 ( 2024-12-13 ) Written in C Operating system Cross-platform License BSD license Website software .es .net /iperf / Repository github .com /esnet /iperf iperf , also known as Iperf or iPerf , is a tool for network performance measurement and tuning. It is a cross-platform tool that can produce standardized performance measurements for any network. iperf has client and server functionality, and can create data streams to measure the throughput between the two ends in one or both directions. [ 2 ] Typical iperf output contains a time-stamped report of the amount of data transferred and the throughput measured. The data streams can be either Transmission Control Protocol (TCP) or User Datagram Protocol (UDP): UDP : When used for testing UDP capacity, iperf allows the user to specify the datagram size and provides results for the datagram throughput and the packet loss. TCP : When used for testing TCP capacity, iperf measures the throughput of the payload. iperf uses 1024 × 1024 for mebibytes and 1000 × 1000 for megabytes . iperf is open-source software written in C , and it runs on various platforms, including Linux , Unix and Windows (either natively or inside Cygwin [ 3 ] ). The availability of the source code enables the user to scrutinize the measurement methodology. iperf is a compatible reimplementation of the ttcp program that was developed at the National Center for Supercomputing Applications at the University of Illinois by the Distributed Applications Support Team (DAST) of the National Laboratory for Applied Network Research (NLANR), [ 4 ] which was shut down on December 31, 2006, on termination of funding by the United States National Science Foundation . iperf3 [ edit ] iperf3 is a rewrite of iperf from scratch to create a smaller, simpler code base. iperf3 was started in 2009, with the first release in January 2014. iperf3 is not backwards compatible with iperf2. iperf3 also includes a library version which enables other programs to use the provided functionality. iperf3 is single-threaded, while iperf2 is multi-threaded. [ 5 ] Officially iperf3 supports only Linux. Unofficial builds for Windows are provided by Vivien Guéant. [ 6 ] A user of Neowin , BudMan, [ 7 ] provides unofficial Windows builds on his server. [ 8 ] Most current Linux distributions have iperf3 in their native package repositories. Unix packages are available from Oracle for Solaris 11.4. See also [ edit ] Flowgrind NetPIPE Netperf Nuttcp bwping Measuring network throughput Packet generation model References [ edit ] ↑ "Iperf 2 – Browse Files" . SourceForge.net . ↑ "iPerf – The TCP, UDP and SCTP network bandwidth measurement tool" . Retrieved 21 January 2021 . ↑ "Cygwin iperf Package" . ↑ "NLANR/DAST : Iperf – The TCP/UDP Bandwidth Measurement Tool" . 2005. Archived from the original on 2008-10-12. ↑ "iperf3 FAQ" . 2018-07-02. ↑ "iPerf – The TCP, UDP and SCTP network bandwidth measurement tool" . iperf.fr . Retrieved 2025-02-04 . ↑ "Iperf 3.18 Windows build" . Neowin . 2014-10-28 . Retrieved 2025-02-04 . ↑ "Home" . files.budman.pw . Retrieved 2025-02-04 . External links [ edit ] Iperf 2 & Iperf 3 Comparison Table Fenton, Tom (2020-02-20). "Using iPerf to Baseline Network Performance" . Schroder, Carla (2007-01-31). "Measure Network Performance with iperf" . Retrieved from " https://en.wikipedia.org/w/index.php?title=Iperf&oldid=1354423731 " Categories : Network performance Software using the BSD license Free software programmed in C Hidden categories: Articles with short description Short description is different from Wikidata Articles needing additional references from March 2020 All articles needing additional references This page was last edited on 16 May 2026, at 09:46  (UTC) . Page was rendered with Parsoid . Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy . Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. , a non-profit organization. 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