What are the FTP TCP ports 21 and 20 used for?

The Protocol Port numbers 21 and 20 are used for FTP. Port 21 is used to establish the connection between the 2 computers (or hosts) and port 20 to transfer data (via the Data channel).

Is FTP port 21 TCP or UDP?

Well-known ports

Port	TCP	Description
20	Yes	File Transfer Protocol (FTP) data transfer
21	Yes	File Transfer Protocol (FTP) control (command)
22	Yes	Secure Shell (SSH), secure logins, file transfers (scp, sftp) and port forwarding
23	Yes	Telnet protocol—unencrypted text communications

What is port 21 used for FTP?

FTP Port 21 is the Default Control Port This is sometimes called the command or control port by default. Then the client makes another connection to the server over port 20 for file transfers to take place. The administrator can change the default port for sending commands and files over FTP.

Is port 21 a UDP?

Side note: UDP port 21 uses the Datagram Protocol, a communications protocol for the Internet network layer, transport layer, and session layer. This protocol when used over PORT 21 makes possible the transmission of a datagram message from one computer to an application running in another computer.

Which port should I use for FTP?

port 21
The FTP protocol typically uses port 21 as its main means of communication. An FTP server will listen for client connections on port 21.

Should I open port 21?

Inbound ports are an open door into an operating system. This port should be blocked. Port 21 – Used by FTP to allow file transfers. Most hosts on your network are not intended to be FTP Servers – don’t leave doors open that don’t need to be open.

What port is needed for FTP?

FTP is an unusual service in that it utilizes two ports, a ‘data’ port and a ‘command’ port (also known as the control port). Traditionally these are port 21 for the command port and port 20 for the data port.

What ports are used by FTP?

FTP uses network ports 20 and 21. Below are other ports that may be used by other types of FTP. BFTP uses port 152. FTP over TSL/ SSL uses ports 989 and 990. NI FTP uses port 47. RSFTP uses port 26. SFTP uses port 115.

What port numbers are used by FTP?

The standard port number for FTP is 21, while SFTP uses port 22 (SSH). If you connect via FTPS , you might be required to enter a custom port number, but the most common one is 990.

Is port 21 secure?

Port 21 is commonly associated with FTP. FTP has been assigned to Port 21 by the Internet Assigned Numbers Authority (IANA). The IANA also oversees global IP address allocation. FTP is often thought of as a “not secure” file transfer protocol.

What does port 20 do?

Port 20 is used in active mode for FTP data transfer. FTP server may run in active or passive mode, which determines how the data connection is established.

What are the FTP TCP ports 21 and 20 used for? The Protocol Port numbers 21 and 20 are used for FTP. Port 21 is used to establish the connection between the 2 computers (or hosts) and port 20 to transfer data (via the Data channel). Is FTP port 21 TCP or UDP? Well-known ports…