20 - File Transfer Protocol (TCP) Data Connection Port*, 21 - File Transfer Protocol (TCP) Control Connection Port*, 22 - Secure Shell (TCP), 23 - Telnet (TCP), 25 - Simple Mail Transfer Protocol (TCP), 53 - Domain Name System (TCP/UDP), 67 - Dynamic Host Configuration Protocol (Server) (UDP), 68 - DHCP (Client) (UDP), 80 - HyperText Transfer Protocol (TCP), 110 - Post Office Protocol (TCP), 137-139 - NetBIOS over TCP/IP (UDP/TCP), 143 - Internet Mail Access (TCP), 161 - Simple Network Management Protocol (UDP), 162 - SNMP Trap Operation (UDP), 389 - Lightweight Directory Access Protocol (TCP), 443 - HTTP Secure (HTTPS) (TCP), 445 - Server Message Block (SMB) (TCP), 3389 - Remote Desktop Protocol (RDP) (TCP),

Network Protocols & Port Numbers

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