netwhy – diagnose slow or unreliable network connections

netwhy is a lightweight Linux command-line tool that diagnoses slow or unreliable network connections. It runs quick checks (latency, packet loss, DNS, optional HTTP) and summarizes where problems are most likely: local link, DNS, or remote host.

This is free and open source software.

Features include:

• Latency and packet loss testing: TCP-connect ping (no root required) with ICMP fallback.
• DNS resolution checks: Verify DNS functionality for multiple hostnames.
• HTTP reachability checks: Test HTTP/HTTPS connectivity to URLs.
• Clear summaries: Human-readable output with natural language interpretations.
• JSON output: Structured JSON format for scripting and automation.
• Zero dependencies: Uses only Python standard library.

Website: github.com/Ninso112/netwhy
Support:
Developer: René
License: GNU General Public License v3.0

netwhy is written in Python. Learn Python with our recommended free books and free tutorials.

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