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v0.10.0 latest

netcheck

A quiet diagnostic tool for home networks.

It runs the checks a patient network engineer would, then tells you in plain English what's wrong and what to do about it, with the most serious problem first.

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tworjaga/netcheck via GitHub API
Latest release v0.10.0 Oct 16, 2026
Last updated Oct 16, 2026 last push · 13:13 UTC
netcheck
netcheck: the menu, ping, an HTTP timing waterfall and a website audit
One small binaryNo runtime to install
No admin rightsFor almost everything
No telemetryNothing leaves without you
Zero dependenciesGo standard library only
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Choose your platform

Version v0.10.0 · released Oct 16, 2026

Windows

x64Installer (.msi)
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ARM64Installer (.msi)
Download
Installs for you only, without admin rights. Remove it in Settings > Apps.

Linux

x64Debian, Ubuntu (.deb) · Fedora, RHEL, openSUSE (.rpm)
ARM64Raspberry Pi 4/5, ARM servers
Install with sudo apt install ./netcheck-linux-amd64.deb or sudo dnf install ./netcheck-linux-amd64.rpm
Or install from a terminal Downloads the latest release, checks it against SHA256SUMS, puts it on your PATH
PowerShell irm https://raw.githubusercontent.com/tworjaga/netcheck/main/scripts/install.ps1 | iex
Linux shell curl -fsSL https://raw.githubusercontent.com/tworjaga/netcheck/main/scripts/install.sh | sh
Features

What it finds

Wi-FiSignal in dBm, band and channel, crowded channels and a better one to switch to
SpeedDownload, upload and bufferbloat (A–F), with the SQM settings to fix it
InternetLatency, jitter and loss to your router and beyond, hop by hop
DNSYour resolver against Cloudflare, Google and Quad9; hijacking; DNSSEC; leaks
Your networkWho's on it, rogue DHCP servers, ports apps opened on your router via UPnP
Your ISPPublic IP and ISP, carrier-grade and double NAT, IPv6, MTU black holes
InterferenceCaptive portals, HTTPS interception by antivirus or proxies, clock skew
Over timeA live monitor with history, timestamped outages and a report for your ISP

One verdict, most serious first

The doctor runs every check that matters in parallel, the speed test last and alone, then ends with what to fix.

Normal modeHome networks
Doctor, speed, ping, watch, DNS, devices, route, Wi-Fi and ports, in plain English.
Advanced modeSysadmins
DNS, TLS, HTTP, routing, firewall and LAN tools. Every one ends in a verdict and speaks JSON.

Same full-screen menu for both. Tab switches; the choice is remembered.

netcheck doctor example output
Connection
Gateway✓192.168.1.12.1 ms
Wi-Fi✓HomeNet · 5 GHz · ch 44-58 dBm
Internet✓1.1.1.114 ms
DNS!Router · slower than Cloudflare180 ms
IPv6✓works · preferred15 ms
NAT!CGNAT
Speed✓312 / 41 Mbps · bufferbloat A+9 ms
Good for
Calls✓good · steady, low latency
Gaming✓good · low latency and steady timing
4K video✓good · plenty of bandwidth
! DNS is slow (180 ms). Cloudflare answers in 11 ms, so switching could speed up browsing.
Commands

Run from the menu or directly

Every command takes --json

EverydayNormal mode
doctorEverything that matters, one verdict
speedDownload, upload, bufferbloat
pingLatency, jitter and packet loss
watchLive dashboard, saved to history
dnsYour DNS against Cloudflare, Google and Quad9
devicesWho is on your network, and who's new
routeLive traceroute, mtr-style
wifiSignal, channels, room-by-room walk test
portsLocal and external reachability
reportA summary to send your ISP
Advanced toolsAdvanced mode
DNSdig · dnstrace · propagate
Domainsdomain · mail · whois
Webhttp · cert · site
Routingtrace · perf
This hostlisten · conns · port · reach
Socketsopen · connect · wake
LANlanaudit · lanwatch
Monitoringuptime · agent
Shared options --json --raw --fail-on --watch -f
Details

Before you download

A report for your ISP

Leave the monitor running for a few days, then send one file: plain-English findings, the numbers behind them, and outages with timestamps.

Contains your public IP. No Wi-Fi names, passwords or device lists.

Requirements

SystemsWindows · Linux
Architecturesx64 · ARM64
Admin rightsNot needed on Windows
DependenciesNone

Platform notes

Windows — Wi-Fi details need Location on. Installer — not code-signed yet, so SmartScreen may warn: More info, then Run anyway. Linux — ping sockets or TCP; DHCP needs root.

Privacy

No telemetry, no accounts. Every probe has a timeout; Ctrl-C always stops cleanly. Updates are verified against SHA256SUMS.
Source, docs and issues live on GitHub.