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
Ports 31600 – 31700
Port 31600- Port 31700 Port 31700- Port 31800 Port 31800- Port 31900 Port 31900-
Port 1596
Ports those registered with IANA are shown as official ports. The same port number
Port 8194
Port 8194 is commonly used for the communication between Apple devices and their management
Ports 37900 – 38000
Port 37900- Port 38000 Port 38000- Port 38100 Port 38100- Port 38200 Port 38200-
Port 6548
Ports those registered with IANA are shown as official ports. The same port number
Port 3604
Port 3604 is generally used for remote desktop services, specifically for Microsoft Remote Desktop
Port 13821
Ports those registered with IANA are shown as official ports. The same port number
Port 3663
Port 3663 is typically used for the Dell OpenManage Server Agent. Ports those registered
Port 3623
Ports those registered with IANA are shown as official ports. The same port number
Port 1771
Port 1771 is generally used for communication between servers and devices that are involved
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