bandwhich displays current network bandwidth use by process, connection, and remote IP address or hostname in a terminal.
Open source
24 alternativesiperf
iperf3 measures TCP, UDP, and SCTP network bandwidth through active tests of achievable throughput.
About iperf
iperf3 performs active measurements of maximum achievable bandwidth on IP networks over TCP, UDP, and SCTP. For each test it reports throughput/bitrate, loss, and other parameters, with tunable timing, protocol, and buffer settings.
It provides a zero-copy sending mode, optional JSON output, CPU affinity setting, and a library version for use in other programs. iperf3 is not backwards compatible with the original iperf, and only Ubuntu Linux, FreeBSD, and macOS are officially supported.
Key features
- Measures TCP, UDP, and SCTP bandwidth through active tests
- Reports throughput, bitrate, and loss for each test
- Tunes timing, protocol, and buffer parameters
- Provides zero-copy sending mode with --zerocopy flag
- Outputs test results in optional JSON format
- Sets CPU affinity with --affinity flag
Best for: Network staff and researchers who need to measure achievable throughput between hosts on IP networks.
Good for
- Supports TCP, UDP, and SCTP measurement in one tool
- Reports throughput, loss, and other parameters per test
- Includes library version and JSON output for use in other programs
Watch out for
- Not backwards compatible with the original iperf
- Official support limited to Ubuntu Linux, FreeBSD, and macOS
iperf at a glance
- Website
- github.com/esnet/iperf
- Category
- Software & Utilities › Linux Apps
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- Android, Linux, macOS
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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iperf FAQ
Is iperf3 compatible with the original iperf?
No, iperf3 is not backwards compatible with the original iperf.
Which platforms are officially supported?
Ubuntu Linux, FreeBSD, and macOS. Other systems including OpenBSD, NetBSD, Android, and Solaris have only reports of success.
How is iperf3 built from source?
Run ./configure; make; make install, and try ./bootstrap.sh first if configure fails.
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