FTP - File Transfer Protocol (Control)

SSH - Secure Shell (Remote Login)

Telnet - Unencrypted text communications

SMTP - Simple Mail Transfer Protocol (Email Routing)

HTTP - Hypertext Transfer Protocol (Unencrypted Web)

POP3 - Post Office Protocol (Email Retrieval)

IMAP - Internet Message Access Protocol (Email Retrieval)

HTTPS - HTTP Secure (Encrypted Web)

Developer Reference

Common Ports Cheat Sheet

List of standard TCP/UDP ports for web, email, databases, and infrastructure.

Network ports are the communication endpoints for your servers. This list covers the most common ports used by web servers (80, 443), databases (3306, 5432), and other critical infrastructure.

File Transfer

File Transfer Protocol (Control)

FTP

Remote Access

Secure Shell (Remote Login)

SSH

Unencrypted text communications

Telnet

Email

Simple Mail Transfer Protocol (Email Routing)

SMTP

Post Office Protocol (Email Retrieval)

POP3

Internet Message Access Protocol (Email Retrieval)

IMAP

Infrastructure

Domain Name System

DNS

Web

Hypertext Transfer Protocol (Unencrypted Web)

HTTP

HTTP Secure (Encrypted Web)

HTTPS

Common alternative HTTP port

HTTP Alt

Database

MySQL Database

MySQL

PostgreSQL Database

PostgreSQL

Redis Key-Value Store

Redis

MongoDB Database

MongoDB

Knowing your ports is essential for configuring firewalls (UFW, AWS Security Groups) and debugging connectivity issues using tools like telnet or nc.