Used for unencrypted web traffic.

Used for secure web traffic using SSL/TLS.

File Transfer Protocol, used for transferring files.

Secure Shell, used for secure remote login and other secure network services.

Domain Name System, used to resolve domain names to IP addresses.

Simple Mail Transfer Protocol, used for sending emails.

Post Office Protocol v3, used by email clients to retrieve emails from a server.

Internet Message Access Protocol, used to retrieve emails and sync them across multiple devices.

Used for unencrypted text-based communication, usually for remote login.

Remote Desktop Protocol, used for remote desktop connections.

Simple Network Management Protocol, used for network management and monitoring.

Secure File Transfer Protocol, a secure version of FTP using SSH.

Trivial File Transfer Protocol, used for simple file transfers, often in embedded systems.

Lightweight Directory Access Protocol, used for accessing and maintaining distributed directory information services.

LDAP over SSL, a secure version of LDAP.

Network Time Protocol, used for clock synchronization between computer systems.

MySQL database service port.

PostgreSQL database service port.

Microsoft SQL Server database service port.

Server Message Block, used for file sharing and network communication between systems.

Authentication protocol used for secure user authentication over a network.

Used for logging system messages in a network.

Border Gateway Protocol, used for exchanging routing information between autonomous systems.

Internet Relay Chat, used for text-based communication in real-time.