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Netstat Cat Xueshi Qiao

monitor netstat network tauri
Use this command to install Netstat Cat:
winget install --id=XueshiQiao.NetstatCat -e

Netstat Cat is a desktop application designed to monitor active TCP and UDP connections in real time, offering advanced filtering capabilities and process identification.

Key Features:

  • Real-time monitoring of network connections with live refresh functionality.
  • Advanced filtering system to search by process name, PID, port ranges, or semantic queries.
  • Process identification that shows which applications own specific network connections.
  • Efficient handling of large numbers of connections using virtualized table performance.
  • Modern user interface with dark/light theme toggle and frameless window design.

Audience & Benefit:
Ideal for system administrators, developers, and security professionals who need to monitor network activity and identify application-specific port usage. Netstat Cat provides a user-friendly alternative to command-line tools like netstat, ensuring transparency into network operations while maintaining performance efficiency.

Installable via winget, Netstat Cat is built with Tauri v2 and Rust, combining cross-platform compatibility with lightweight resource usage.

README

Netstat Cat

> A powerful network monitoring tool with real-time connection tracking and advanced filtering capabilities

[English] [中文]

Overview

Netstat Cat is a lightweight desktop application built with Tauri v2 and Rust, providing a user-friendly interface for monitoring network connections on macOS and Windows. It serves as a graphical replacement for the command-line netstat tool, making it easier to monitor network activity and identify which applications are using specific ports.

Key Features

  • Security & Privacy - Pure local operation with no network connections or data transmission

  • Real-time Network Monitoring - Live display of active TCP/UDP connections

  • Process Identification - Shows which processes own each network connection

  • Advanced Filtering System - Search by process name, PID, port ranges, or semantic queries like process=chrome && lport>1000 See filtering guide

  • Virtualized Table Performance - Efficiently handles large numbers of connections using React Virtuoso

  • Lazy Process Resolution - Only fetches full executable paths when hovering over processes

  • LRU Caching - Intelligent caching for process paths to avoid repeated system calls

  • Modern UI - Frameless window with dark/light theme toggle

  • Auto-refresh Mode - Configurable live monitoring (2-second intervals)

Screenshots

Light theme on macOS Dark theme on macOS Advanced query filtering on macOS Light theme on Windows Dark theme on Windows
Versions
0.1.0
Website
github.com
License
Last updated
2/19/2026
Download latest version

Getting Started

Install App

  • macOS only (Homebrew)
brew install --cask xueshiqiao/tap/netstat-cat
  • macOS and Windows (Direct Download)

Download from GitHub Releases: https://github.com/XueshiQiao/netstat-cat/releases

Quick Start

Prerequisites

  • macOS 10.15+ or Windows 10+
  • Node.js 20+
  • npm
  • Rust (install via rustup)

Installation (Build from Source)

# Clone the repository
git clone https://github.com/XueshiQiao/netstat-cat.git
cd netstat-cat

# Install dependencies
npm install

Development

# Start Tauri development server (compiles Rust backend + starts Vite)
npm run tauri:dev

# Run type checking
npm run typecheck

# Run linting
npm run lint

Building

# Build for current platform
npm run tauri:build

Usage Guide

Basic Monitoring

  1. Launch the application to see all active network connections
  2. Use the filter buttons to quickly narrow by protocol, IP version, or connection state
  3. Enable auto-refresh for live monitoring

Advanced Filtering

  • Simple Search: Type process names, PIDs, or ports (e.g., chrome, 8080)
  • Wildcards: Use * for pattern matching (e.g., *.exe)
  • Port Ranges: Use ranges like 80-443
  • Semantic Queries: Use advanced syntax like process=chrome && lport>1000

See filters_en.md for complete filtering documentation.

Technical Architecture

Frontend Stack

  • React 19 with TypeScript
  • Tailwind CSS for styling
  • React Virtuoso for virtualized scrolling
  • Vite for frontend bundling

Backend (Rust)

  • Tauri v2 for native desktop integration (uses OS webview, ~5MB binary)
  • netstat2 crate for cross-platform socket enumeration
  • sysinfo crate for PID-to-process name resolution
  • Tauri IPC for communication between frontend and Rust backend

Performance Features

  • Lazy loading of process paths
  • Virtualized table rendering
  • Efficient caching strategies
  • Optimized system calls

Development

IDE Setup

Recommended: VSCode + ESLint + Prettier

Project Structure

netstat-cat/
├── src/                  # React frontend
│   ├── App.tsx           # Main UI component
│   ├── main.tsx          # Entry point
│   ├── assets/           # CSS and images
│   └── utils/            # Query parser, process cache
├── src-tauri/            # Rust backend
│   ├── src/
│   │   ├── lib.rs        # Tauri app setup & command registration
│   │   ├── netstat.rs    # Network socket fetching logic
│   │   └── process_info.rs  # Data structures
│   ├── Cargo.toml
│   └── tauri.conf.json   # Tauri configuration
├── index.html
├── vite.config.ts
└── resources/            # Icons and entitlements

Scripts

  • npm run tauri:dev - Start Tauri development mode
  • npm run tauri:build - Build for production
  • npm run typecheck - Run TypeScript type checking
  • npm run lint - Run ESLint
  • npm run format - Format code with Prettier

Contributing

  1. Fork the repository
  2. Create a feature branch
  3. Make your changes
  4. Run tests and linting
  5. Submit a pull request

License

This project is licensed under the GNU General Public License v3.0 - see the LICENSE file for details.

Related Documentation

  • Filtering Guide (English)
  • 过滤指南 (中文)