Network diagnostics for Mac and Windows
Subnetry tests your speed, maps your Wi-Fi channels, finds every device and open port, and traces the route to the internet. Then it scores your network and tells you the exact setting to change.
Free · No account · Your results stay on your computer
Everything in one app
Every result comes with what it means and what to do about it, so you don't need to be a network engineer to use it.
Health Check
The full scan runs a speed test, a traceroute, a device and port scan and a Wi-Fi scan in a few minutes. Each problem costs points, and the fixes are ranked by how much they're worth.
Wi-Fi
See every network around you on 2.4, 5 and 6 GHz, with signal in dBm and which channels overlap. Subnetry recommends 1, 6 or 11 on 2.4 GHz, a channel without radar checks on 5 GHz, and a preferred scanning channel on 6 GHz.
Traceroute
Every hop to a website, with its name, the network that runs it and its country. Subnetry tells you whether delay starts at your router, at your internet provider, or is simply the distance to another continent.
Toolkit
A subnet calculator that shows network and host bits in binary, a DNS lookup that decodes SPF, DKIM and DMARC, a MAC vendor lookup and a reference of common ports and how risky they are to leave open.
Download
Free for Mac and Windows. Everything it needs is included.
Apple Silicon: M1 and newer
Download for MacIntel processor
Download for Intel MacWindows 10 and 11, 64-bit
Download for WindowsNot sure which Mac you have? Open the Apple menu › About This Mac. "Chip: Apple M…" means Apple Silicon; "Processor: Intel" means Intel. On Linux, run it from source.
Install
The security prompts appear because Subnetry isn't code-signed by Apple or Microsoft yet. To update, download the new version and install it over the old one; your saved reports are kept.
Optional extras
Subnetry works on its own. Its Setup page shows what's missing and installs these with one click where it can.
| Tool | Adds | Without it |
|---|---|---|
| Speedtest.net CLI | Official Speedtest.net results | Speed tests use Cloudflare instead |
| Nmap | The Port Scanner tab and faster port checks | The Full Scan uses Subnetry's built-in scanner |
| Wireshark | The Traffic Analyzer | Traffic Analyzer is unavailable |
Privacy
There's no account and no tracking. Scan results and reports are saved only on your computer, in a folder called Subnetry-Reports.
Some tests have to reach the internet. These are the only times Subnetry does:
Only scan networks and devices you own or have permission to test. Port scans of other people's systems can break their terms of use or the law.
Questions
Yes. There are no paid tiers, ads or accounts.
Apple and Microsoft show a warning for apps that aren't signed with a paid developer certificate. Subnetry isn't signed yet, so you confirm once that you want to open it (see Install above). After that it opens normally.
macOS and Windows 11 hide nearby network names from apps without Location permission, because they could reveal where you are. Allow location access when asked. Subnetry uses it only to read Wi-Fi details.
No. On Wi-Fi and modern home networks a computer only sees its own traffic plus announcements other devices broadcast. The Network Scanner finds devices and their open ports; it doesn't read anyone's traffic.
Never. Subnetry only measures and recommends. You make any change yourself, in your router's settings.
Yes, from source: it needs Python 3.10 or newer. The instructions are on GitHub.
Mac: drag Subnetry from Applications to the Trash. Windows: Settings › Apps › Installed apps › Subnetry › Uninstall. Your reports stay in the Subnetry-Reports folder until you delete it.
