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Version 1.2.0 is out

Find out why it won’t connect.

NetWrench is a network diagnostics toolkit for Windows. Port checks, DNS lookups, TLS certificates and subnet math live in one portable app, and nothing leaves your machine until you ask.

Download for WindowsPortable .exe, 41.5 MB Download .zip42.7 MB

For 64-bit Windows 10 and 11. Nothing to install.

The NetWrench dashboard: local IP address, gateway, DNS servers, network interface, quick actions and recent diagnostics

Every tool answers a question you already ask.

Pick the question, open the tool. The names match the NetWrench sidebar, so you’ll know exactly where to click.

  • What’s my IP, gateway and DNS server right now?

    Dashboard

  • Is port 443 open on that server?

    TCP Port Checker

  • Does this name resolve, and to what?

    DNS Toolbox

  • When does this certificate expire?

    TLS Inspector

  • Which of these hosts and ports can I reach?

    Connection Matrix

  • Can this machine get to the internet?

    Internet Connectivity

  • Something’s wrong with this host. Where do I start?

    Quick Diagnostics

  • How many usable hosts fit in a /22?

    Subnet Calculator
Also in the app: Local Network Kubernetes Saved Profiles Reports & History

Quiet by default.

NetWrench is made for jumpboxes and locked-down networks, where unexpected traffic is a problem.

  • No requests on its ownIt doesn’t contact any outside service by itself. Public IP lookups and internet checks run only when you click them.
  • Results stay in memoryDiagnostics live in the current session. Saved history stays off until you turn it on in Settings.
  • PortableOne .exe and nothing to install. Run it from any folder or a USB stick.
Public IP addressLook up
Not requested
External lookup only on request
Internet connectivity
Not tested
Explicit check only

This is how the dashboard looks until you run a check yourself.

Download NetWrench 1.2.0

Released 9 November 2026. Both files contain the same app. The .zip is there for networks that block .exe downloads.

Portable app41.5 MB

NetWrench-v1.2.0-portable.exe

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Zip archive42.7 MB

NetWrench-v1.2.0-win-x64.zip

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All checksums are in SHA256SUMS.txt.

Getting started

  1. Download the portable appOr download the .zip and extract it.
  2. Run NetWrench-v1.2.0-portable.exeNothing gets installed. Keep the file wherever you like.
  3. If SmartScreen stops it, click More info, then Run anywayWindows shows “Windows protected your PC” for apps that aren’t code-signed yet.

Check the file

Open Command Prompt in the folder with the download and run:

certutil -hashfile NetWrench-v1.2.0-portable.exe SHA256

The result should match the SHA256 shown for that file.