Iperf, developed by the genius Mark Gates, has grown to become one of the most talked-about software for Windows, and we can see why! Its high precision and accuracy in network measurement never fail, allowing users to learn more about their network capabilities. With its straightforward interface and easy-to-use features, Iperf is a must-have for tech-savvy individuals and network professionals alike. Get a glimpse of this revolutionary software by downloading it for Windows 7 today!

iPerf3 is a tool for active measurements of the maximum achievable bandwidth on IP networks. It supports tuning of various parameters related to timing, buffers and protocols (TCP, UDP, SCTP with IPv4 and IPv6). For each test it reports the bandwidth, loss, and other parameters. This is a new implementation that shares no code with the original iPerf and also is not backwards compatible.

iPerf was orginally developed by NLANR/DAST. iPerf3 is principally developed by ESnet / Lawrence Berkeley National Laboratory. It is released under a three-clause BSD license.

iPerf features:

TCP and SCTP
Measure bandwidth
Report MSS/MTU size and observed read sizes.
Support for TCP window size via socket buffers.
UDP
Client can create UDP streams of specified bandwidth.
Measure packet loss
Measure delay jitter
Multicast capable
Cross-platform: Windows, Linux, Android, MacOS X, FreeBSD, OpenBSD, NetBSD, VxWorks, Solaris,...
Client and server can have multiple simultaneous connections (-P option).
Server handles multiple connections, rather than quitting after a single test.
Can run for specified time (-t option), rather than a set amount of data to transfer (-n or -k option).
Print periodic, intermediate bandwidth, jitter, and loss reports at specified intervals (-i option).
Run the server as a daemon (-D option)
Use representative streams to test out how link layer compression affects your achievable bandwidth (-F option).
A server accepts a single client simultaneously (iPerf3) multiple clients simultaneously (iPerf2)
New: Ignore TCP slowstart (-O option).
New: Set target bandwidth for UDP and (new) TCP (-b option).
New: Set IPv6 flow label (-L option)
New: Set congestion control algorithm (-C option)
New: Use SCTP rather than TCP (--sctp option)
New: Output in JSON format (-J option).
New: Disk read test (server: iperf3 -s / client: iperf3 -c testhost -i1 -F filename)
New: Disk write tests (server: iperf3 -s -F filename / client: iperf3 -c testhost -i1)

New Release
Added bidirectional testing both simultaneously and tradeoff
Added server side statistic reporting on the client for UDP
Limits on the number of connections and locations for servers
Fixed the IPv6 Multicast implementation
[ Iperf release history ]

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