Common Ports and Protocols

TCP

• FTP (21)

• SSH (22)

• Telnet (23)

• SMTP (25)

• DNS (53)

• HTTP (80) / HTTPS (443)

• POP3 (110)

• SMB (139 + 445)

• IMAP (143)

UDP

• DNS (53)

• DHCP (67, 68)

• TFTP (69)

• SNMP (161)