Network+ ports

FTP (File Transfer Protocol)

Ports 20, 21 (TCP) - Port 20 is for data transfer, and Port 21 is for connection control.

SSH (Secure Shell)

Port 22 (TCP) - Cryptographic network protocol for operating network services and remote command-line login securely.

SFTP (Secure File Transfer Protocol)

Port 22 (TCP) - Secure file transfer over an SSH connection.

Telnet

Port 23 (TCP) - Unencrypted, legacy protocol for accessing remote computers over a network.

SMTP (Simple Mail Transfer Protocol)

Port 25 (TCP) - Used for server-to-server email transmission (sending emails).

DNS (Domain Name System)

Port 53 (TCP/UDP) - Translates human-readable domain names into IP addresses.

DHCP (Dynamic Host Configuration Protocol)

Ports 67, 68 (UDP) - Port 67 is for the server, 68 is for the client. Automatically assigns IP addresses to devices on a network.

TFTP (Trivial File Transfer Protocol)

Port 69 (UDP) - Simple, unencrypted file transfer, often used for downloading firmware or booting OS images over a local network.

HTTP (Hypertext Transfer Protocol)

Port 80 (TCP) - Foundation of data communication for the World Wide Web (unencrypted).

POP3 (Post Office Protocol v3)

Port 110 (TCP) - Used by local email clients to retrieve and download email from a remote server.

NTP (Network Time Protocol)

Port 123 (UDP) - Synchronizes clocks between computer systems over a network.

IMAP (Internet Message Access Protocol)

Port 143 (TCP) - Used by email clients to retrieve and manage email messages directly on a server (syncing).

SNMP (Simple Network Management Protocol)

Ports 161, 162 (UDP) - Used to monitor and manage network devices (161 is for querying agents, 162 is for receiving traps/alerts).

LDAP (Lightweight Directory Access Protocol)

Port 389 (TCP/UDP) - Used to access and maintain distributed directory information services (like Microsoft Active Directory).

HTTPS (Hypertext Transfer Protocol Secure)

Port 443 (TCP) - Secure, encrypted version of HTTP used for safe web browsing.

SMB (Server Message Block)

Port 445 (TCP) - Used for providing shared access to files, printers, and serial ports, primarily in Windows networks.

Syslog

Port 514 (UDP) - Standard for message logging, allowing network devices to send event messages to a central logging server.

SMTP TLS (Secure Mail Submission)

Port 587 (TCP) - Encrypted email submission from a client to a mail server.

LDAPS (Secure LDAP)

Port 636 (TCP) - LDAP over TLS/SSL for secure, encrypted directory queries.

RDP (Remote Desktop Protocol)

Port 3389 (TCP/UDP) - Proprietary Microsoft protocol providing a graphical interface to connect to another computer over a network.

SIP (Session Initiation Protocol)

Ports 5060, 5061 (TCP/UDP) - Used to initiate, maintain, and terminate real-time communications like VoIP video and voice calls (5060 is unencrypted, 5061 is encrypted).