Networking - Important Ports

Echo

Port: 7 Used to test connectivity in network communication

FTP

Port: 21 Used for transferring files between a client and a server on a network

SSH/SCP/SFTP

Port: 22 Secure Shell (SSH) is a protocol for secure remote login and other secure network services; SCP (Secure Copy Protocol) and SFTP (Secure File Transfer Protocol) are used to securely transfer files over SSH

SMTP

Port: 25 Used for sending emails between servers

DNS

Port: 53 Responsible for translating domain names into IP addresses

DHCP/BOOTP

Port: 67/68 Dynamic Host Configuration Protocol (DHCP) provides dynamic IP addressing; BOOTP (Bootstrap Protocol) is an earlier protocol used for diskless workstations

TFTP

Port: 69 A simpler version of FTP that allows file transfers with minimal features

HTTP

Port: 80 The foundation of data communication on the World Wide Web; operates on port 80.

Kerberos

Port: 88/464 A network authentication protocol designed to provide strong authentication for client/server applications

POP3

Port: 110 Used by email clients to retrieve emails from a server; operates on port 110.

NTP

Port: 123 Used to synchronize clocks of computers over a network

HTTPS

Port: 443 An extension of HTTP that uses SSL/TLS to encrypt communications for secure data transfer

IMAP

Port: 143 Allows email clients to access and manage messages on an email server

MySQL

Port: 3306 An open-source relational database management system that uses Structured Query Language

SMTP (submission)

Port: 587 Used for email submission from local clients to mail servers

RADIUS

Port: 1812 A networking protocol used to provide centralized Authentication, Authorization, and Accounting (AAA) management for users connecting to a network