20 - File Transfer Protocol (FTP) DATA, 21 - File Transfer Protocol (FTP) CONNECTION, 22 - Secure Shell (SSH), 23 - Telnet , 25 - Simple Mail Transfer Protocol (SMTP), 53 - Domain Name System (DNS), 67, 68 - Dynamic Host Protocol Configuration (DHCP), 69 - Trivial File Transfer Protocol (TFTP), 80 - HyperText Transfer Protocol (HTTP), 110 - Post Office Protocol (POP3), 137 - 139 - NetBIOS Over TCP/IP, 143 - Internet Mail Access Protocol (IMAP), 161 - Simple Network Management Protocol (SNMP) Communicating with SNMP Agents, 162 - Simple Network Management Protocol (SNMP) Agents send unsolicited Traps, 389 - Light Directory Access Protocol (LDAP) , 427 - Service Location Protocol (SLP), 443 - HTTP Secure (HTTPS), 445 - Server Message Block (SMB) / Common Internet File System (CIFS), 548 - The Apple File Protocol (AFP), 993 - IMAP over SSL / IMAP Secure (IMAPS), 3389 - Remote Desktop Protocol (RDP),

Common Port Practice

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