# esnet/iperf

iperf3:  A TCP, UDP, and SCTP network bandwidth measurement tool

Repository: https://github.com/esnet/iperf
Canonical: https://ross.abutalabs.com/products/iperf
Homepage: http://software.es.net/iperf/
Language: C
License: NOASSERTION
License Family: other
Topics: iperf3
Last push: 2026-07-10T19:21:20+00:00

## Health v2 (maintenance only)
Score: 80/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 91, release rhythm 54, longevity 100
- inputs: {"age_days": 4572, "days_push": 54, "days_rel": 146, "gap_med": 128.5, "n_releases_24m": 5}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 8718, forks 1443 (observed 2026-08-28T04:10:24.425824+00:00)

## What it is
iperf3 is a command-line tool for actively measuring the maximum achievable bandwidth on IP networks over TCP, UDP, and SCTP. It reports throughput, packet loss, and other metrics, and is developed by ESnet / Lawrence Berkeley National Laboratory under a three-clause BSD license.

## Use cases
- measure network bandwidth between two hosts
- test throughput over TCP, UDP, or SCTP
- diagnose network performance problems
- benchmark packet loss and jitter
- run network performance tests as part of perfSONAR
- get JSON output of throughput tests for automation

## When to choose
- you need a standard, widely-used tool for active bandwidth measurement
- you want tunable test parameters for timing, protocols, and buffers
- you need a lightweight C tool with a library version for embedding
- you are troubleshooting or benchmarking IP network paths

## When to avoid
- you need backwards compatibility with original iperf or iperf2 clients/servers
- you need a GUI-based network testing tool
- you require passive traffic monitoring rather than active measurement

## Facets
- artifact type: cli-tool
- maturity: active
- function: networking, monitoring, benchmarking, developer-tools
- domain: networking, performance, developer-tools
- platform: bsd, windows, cli, cross-platform
- tags: network-bandwidth, throughput-testing, tcp, udp, sctp, iperf3, network-diagnostics, c, command-line, linux, macos, android

## Member repositories
- esnet/iperf (main) score 80

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:24.425824+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:25:20.849295+00:00, confidence not recorded.
  - readme: https://github.com/esnet/iperf (fetched 2026-08-28T04:10:24.425824+00:00, sha d17859164272)
  - homepage: http://software.es.net/iperf/ (fetched 2026-08-29T08:25:42.991877+00:00, sha 4d620fca57e7)
  - site_page: http://software.es.net/iperf/faq.html (fetched 2026-08-29T08:25:43.000882+00:00, sha d34ec9be78f7)
- Data as of 2026-08-30T08:39:29.467469+00:00.