Ports 20 (TCP) - Makes files available for download across a network (data connection port), Port 21 (TCP) - Makes files available for download across a network (control connection port), Port 22 (TCP) - Make a secure connection to the command-line interface of a server, Port 23 (TCP) - Make an unsecure connection to the command-line interface of a server, Port 25 (TCP) - Transfer email messages, Port 53 (Both) - Facilitate identification of hosts by name alongside IP addressing, Port 67 (UDP) - Provision an IP address configuration to clients, Port 68 (UDP) - Request a dynamic IP address configuration from a server, Port 80 (TCP) - Used for insecure web browsing, Port 110 (TCP) - Used for receiving incoming emails , Port 137 - 139 (Both) - Used for file or printer sharing in a Windows network, Port 143 (TCP) - Read and manage mail messages on a server mailbox, Port 161 (UDP) - Query status information from network devices, Port 162 (UDP) - Report status information to a management server, Port 389 (TCP) - Query information about network users and resources, Port 443 (TCP) - Used as a secure and encrypted version of web browsing, Port 445 (TCP) - Used for Windows file and sharing services, Port 3389 (TCP) - Provides graphical remote control of another client or server,

Port Numbers & Definitions

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