3000
Development
Common development server port
TCP
Web
Port Information
Port Number
3000
Protocol
TCP
Category
Web
Common Usage
URL with Port
http://localhost:3000 https://example.com:3000
Node.js/Express Server
const express = require('express');
const app = express();
const PORT = 3000;
app.listen(PORT, () => {
console.log(`Server running on port ${PORT}`);
});Docker Port Mapping
docker run -p 3000:3000 myapp # In docker-compose.yml ports: - "3000:3000"
Firewall Configuration
# Linux/Ubuntu firewall sudo ufw allow 3000/tcp # Check if port is in use netstat -an | grep 3000
Port 3000 - Development
Common development server port This is a TCP port commonly used in web applications. Port numbers range from 0-65535, with ports 0-1023 being well-known system ports, 1024-49151 being registered ports, and 49152-65535 being dynamic/private ports.