Commonly Used Ports

These are the most commonly used ports, alongside their port numbers.

• 20: File Transfer Protocol (FTP) data channel.
• 21: File Transfer Protocol (FTP) control channel. The commands port.
• 22: Secure Shell (SSH). Remote management protocol OS.
• 23: Telnet, or terminal network, for protocol implementation text interface across a network.
• 25: Simple Mail Transfer Protocol (SMTP).
• 37: Time protocol.
• 43: WHOIS. Protocol for obtaining registration of ownership details for IP addresses and domain names.
• 53: Domain Name System (DNS).
• 67: Dynamic Host Configuration Protocol (DHCP). Dynamic IP.
• 69: Trivial File Transfer Protocol (TFTP).
• 79: Finger protocol.
• 80: Hypertext Transfer Protocol (HTTP).
• 88: Kerberos.
• 109: Post Office Protocol v2 (POP2). Protocol for receiving emails, version two.
• 110: Post Office Protocol v3 (POP3). Protocol for receiving emails, version three.
• 115: Secure File Transfer Protocol (SFTP). Protocol for secure transmission of data.
• 118: SQL Services.
• 123: Network Time Protocol (NTP)
• 143: Internet Message Access Protocol (IMAP). Protocol at the application level, for accessing emails.
• 161: Simple Network Management Protocol (SNMP). Protocol for device management.
• 162: Simple Network Management Protocol (SNMP) Trap.
• 179: Border Gateway Protocol (BGP).
• 194: Internet Relay Chat (IRC).
• 389: Lightweight Directory Access Protocol (LDAP). Application layer protocol.
• 443: Hypertext Transfer Protocol Secure (HTTPS). HTTP protocol, with support for encryption.
• 464: Kerberos reset password.
• 465: Simple Mail Transfer Protocol over SSL (SMTPS).
• 514: Syslog.
• 515: Line Printer Daemon (LPD). Protocol for remote printing.
• 530: Remote Procedure Call (RPC).
• 543: Kerberos login.
• 544: Real Time Stream Control Protocol (RTSP).
• 547: DHCPv6 server.
• 993: Internet Message Access Protocol over SSL (IMAPS). IMAP protocol with support for SSL encryption.
• 995: Post Office Protocol 3 over SSL (POP3S). POP3 protocol with support for SSL encryption.
• 1080: SOCKet Secure (SOCKS). Protocol for receiving secure and anonymous access.
• 3128: Proxy. Port often used for proxies.
• 3306: MySQL, for MySQL database.
• 3389: Remote Desktop Protocol (RDP), for Windows.
• 5432: Postgres Database (PostgreSQL).
• 5900: Virtual Network Computing (VNC). For desktop remote access.
• 5938: TeamViewer, for the remote-control system, to facilitate data computer and data exchange.
• 8080: HTTP/Web. An alternate HTTP protocol port.

source:  https://www.dnsstuff.com/open-port-checkers-scanners

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