21 - FTP (File Transfer Protocol), 22 - SSH (Secure Shell), 23 - Telnet, 25 - SMTP (Simple Mail Transfer Protocol), 53 - DNS (Domain Name Service), 80 - HTTP (Hypertext Transfer Protocol), 110 - POP3 (Post Office Protocol 3), 143 - IMAP (Internet Message Access Protocol), 443 - HTTPS (Hypertext Transfer Protocol Secure), 3389 - RDP (Remote Desktop Protocol), 137-139 - NetBIOS/NetBT, 445 - SMB/CIFS (Server Message Block/Common Internet File System), 67/68 - DHCP (Dynamic Host Configuration Protocol), 389 - LDAP (Lightweight Directory Access Protocol), 161/162 - SNMP (Simple Network Management Protocol),

TCP/IP Ports (Chapter 6)

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