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20

FTP Data

File Transfer Protocol (data)

TCP
File Transfer

Port Information

Port Number

20

Protocol

TCP

Category

File Transfer

Common Usage

URL with Port

http://localhost:20
https://example.com:20

Node.js/Express Server

const express = require('express');
const app = express();
const PORT = 20;

app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});

Docker Port Mapping

docker run -p 20:20 myapp

# In docker-compose.yml
ports:
  - "20:20"

Firewall Configuration

# Linux/Ubuntu firewall
sudo ufw allow 20/tcp

# Check if port is in use
netstat -an | grep 20