Port 21

Modified by:

Port 21 is commonly used for FTP (File Transfer Protocol), which is a protocol used for transferring files between computers on a network. It is used for uploading and downloading files to and from remote servers.

Ports those registered with IANA are shown as official ports. The same port number may be unofficialy used by various services or applications. The official usage are listed separately below its usage may change from time to time.

Official

Port
Protocol (TCP/UDP)
Title
Description
Port Type
Port 21
tcp
ftp
File Transfer [Control]
WELL KNOWN PORT
Port 21
udp
ftp
File Transfer [Control]
WELL KNOWN PORT
Port 21
sctp
ftp
FTP
WELL KNOWN PORT

UnOfficial

Unofficialy or sometimes with conflict, the same port may be used by different applications.

Port Protocol (TCP/UDP) Description
TCP UDP Ports
Other ports
Port 156
Port 156 is not a well-known port. It is not assigned to any specific
Port 167
Port 167 is used for the NAMP (NIS+ Authentication and Name Service) protocol, which
Port 1948
Port 1948 is used for broadcasting messages in real-time using the Secure Real-Time Transport
Port 2956
Ports those registered with IANA are shown as official ports. The same port number
Port 2038
Ports those registered with IANA are shown as official ports. The same port number
Port 4042
Ports those registered with IANA are shown as official ports. The same port number
Port 1434
Port 1434 is used for Microsoft SQL Server named instances. It is a port
Port 622
Port 622 is not an official port number assigned by IANA. It may be
Ports 22800 – 22900
Port 22800- Port 22900 Port 22900- Port 23000 Port 23000- Port 23100 Port 23100-
Port 11320
Ports those registered with IANA are shown as official ports. The same port number
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