Common Network Ports and Protocols

A complete set of vocabulary flashcards mapping common network ports to their respective services, transport protocols, and technical details based on the Common Ports Help Sheet - 2025.

FTP (File Transfer Protocol)

A file transfer service operating over TCP on ports 20 and 21.

SFTP (SSH File Transfer Protocol)

A secure file transfer protocol operating over TCP on port 22.

SCP (Secure Copy Protocol)

A secure data transfer protocol operating over TCP on port 22.

FTPS (File Transfer Protocol Secured)

A secure file transfer protocol that uses TLS and operates over TCP on ports 989 and 990.

TFTP (Trivial File Transfer Protocol)

A simplified file transfer service operating over UDP on port 69.

SMB (Server Message Block)

A network file sharing protocol operating over TCP on port 445.

HTTP (Hypertext Transfer Protocol)

A protocol for transmitting web pages operating over TCP on port 80.

HTTPS (HTTP Secured)

A secure version of HTTP operating over TCP on port 443.

HTTP Proxy

A proxy service for HTTP traffic operating over TCP on port 8080.

DNS (Domain Name Service)

A naming service operating over TCP/UDP on port 53; utilizes UDP for queries and TCP for zone transfers.

SNMP (Simple Network Management Protocol)

A network management protocol operating over UDP on port 161.

NTP (Network Time Protocol)

A networking protocol for clock synchronization operating over UDP on port 123.

SMTP (Simple Mail Transfer Protocol)

An email transmission protocol operating over TCP on port 25.

SMTPS

Simple Mail Transfer Protocol with SSL operating over TCP on port 465.

SMTP with TLS / MSA (Message Submission Agent)

Email submission service using TLS operating over TCP on port 587.

LDAP (Lightweight Directory Access Protocol)

A directory service protocol operating over TCP/UDP on port 389.

LDAPS

Lightweight Directory Access Protocol over SSL/TLS operating over TCP on port 636.

Kerberos

An authentication service operating over UDP on port 88.

RADIUS (Remote Authentication Dial-In User Service)

An authentication and accounting protocol operating over UDP on ports 1812 and 1813.

TACACS+ (Terminal Access Controller Access-Control System)

A remote authentication protocol operating over TCP on port 49.

POP3 (Post Office Protocol)

An email retrieval protocol operating over TCP on port 110.

IMAP (Internet Message Access Protocol)

An email retrieval and management protocol operating over TCP on port 143.

POP3(S)

Post Office Protocol over SSL/TLS operating over TCP on port 995.

IMAP(S)

Internet Message Access Protocol over SSL/TLS operating over TCP on port 993.

DHCP (Dynamic Host Configuration Protocol)

A network management protocol for automatically assigning IP addresses operating over UDP on ports 67 and 68.

Telnet

An unencrypted terminal emulation protocol operating over TCP on port 23.

SSH (Secure Shell)

A secure network protocol for remote command-line login operating over TCP on port 22.

RDP (Remote Desktop Protocol)

A proprietary protocol for remote desktop connections operating over TCP on port 3389.

VNC over HTTP (Virtual Network Computing over HTTP)

A graphical desktop-sharing system accessed via HTTP operating over TCP on port 5800.

syslog

A standard for message logging operating over UDP on port 514.

SQL Server

A database management service operating over TCP on port 1433.

SQLnet

Oracle database network service operating over TCP on port 1521.

MySQL

An open-source relational database management system operating over TCP on port 3306.

H.323

A telecommunications protocol replaced by SIP that operates over TCP on port 1720.

SIP (Session Initiation Protocol)

A signaling protocol for VoIP sessions operating over TCP/UDP on port 5060, with UDP preferred.

SIP-TLS

Session Initiation Protocol secured over TLS operating over TCP/UDP on port 5061.