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Traditionally these are port 21 for the command port and port 20 for the data port. We will see the opposite behavior when we use passive FTP.

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Posted by waqasahmad

FTP uses both ports

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Posted by HamidAliKhan

see the links below
http://www.auditmypc.com/port/udp-port-21.asp
http://www.auditmypc.com/port/tcp-port-20.asp

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Posted by Hash007

FTP.

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Posted by waqqas1

FTP uses TCP port 20 for data and TCP port 21 for control.

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Posted by suresh123