Well-known · Cross-platform

21 FTP control

TCP Yes
UDP Assigned
SCTP Yes
DCCP —

What it is

File Transfer Protocol command/control channel.

When / why

Cleartext credentials — restrict tightly or replace with SFTP (22).

Protocol status detail

TransportStatusMeaning
TCP Yes Assigned by IANA and standardized, specified, or widely used on this port.
UDP Assigned Assigned by IANA, but not standardized, specified, or widely used on this port.
SCTP Yes Assigned by IANA and standardized, specified, or widely used on this port.
DCCP — Not applicable for this transport.
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Port range

Well-known (0–1023). System port for a core service. On Unix-like systems, binding it requires superuser privileges.

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