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
Port 20 - FTP Data
File Transfer Protocol (data) This is a TCP port commonly used in file transfer 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.