Port 20  (TCP) - File Transfer Protocol, for data transfer,used by the FTP server to transfer data to the FTP client, typically for downloading files from the server., Port 21 (TCP) - FTP control commands, such as login and file listing, are sent over this port. This is the port that FTP clients use to connect to FTP servers., Port 22 (TCP) - Secure SHell is a secure protocol used for remote access to servers and other devices. This port is the default port for SSH, but it can be configured to use a different port for security reasons., Port 23 (TCP) - Telnet is a legacy protocol for remote access to devices. It sends commands and receives responses in plain text, making it insecure. Telnet has largely been replaced by SSH., Port 25 (TCP) - SMTP is the protocol used for sending email messages between servers. Port 25 is the default SMTP port, but some email providers may use alternate ports for SMTP traffic., Port 53 (TCP-UDP) - DNS is the system that translates domain names into IP addresses. DNS queries are sent over this port., Port 67 (UDP) - DHCP servers assign IP addresses to devices on a network. DHCP requests are sent to the server over this port., Port 68 (UDP) - DHCP clients send requests for IP addresses to the DHCP server over this portport., Port 80 (TCP) - HTTP is the protocol used for web traffic. This port is the default port for HTTP traffic., Port 110 (TCP) - POP3 is an email retrieval protocol. Email clients use POP3 to download email messages from a server. This port is the default POP3 port., Ports 137-139 (TCP-UDP) - NetBIOS is an older protocol used for file sharing and printer sharing in Windows networks. These ports are used for NetBIOS traffic., Port 143 (TCP) - IMAP is another email retrieval protocol. It allows users to view and manage email messages on a server without downloading them to their local device., Port 161 (UDP) - SNMP is a protocol used for network management. SNMP agents on devices send information about the device's status to a network management system using SNMP over this port., Port 162 (UDP) - SNMP traps are messages sent by devices to a network management system to notify it of an event, such as a system failure. SNMP traps are sent over this port, Port 389 (TCP) - LDAP is a directory service used for storing and retrieving information about network resources., Port 443 (TCP) - HTTPS is a secure version of HTTP. It encrypts web traffic to prevent eavesdropping and tampering., Port 445 (TCP) - SMB is a file sharing protocol used in newer versions of Windows. It allows users to access files and printers on a network., Port 3389 (TCP) - RDP is a protocol used for remote access to Windows servers and other devices. It allows users to connect to a remote device and control it as if they were physically present., Port 995 (TCP) - POP3S (SSL/TLS), Port 993 (TCP) - IMAPS (SSL/TLS), Port 25/587 (TCP) - SMTP w/ STARTTLS encryption.,

Common Port Numbers (Detailed)

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