FTP Port

What port Number does an FTP use?

21 primary, 20 data

Thanks

Port 21 is the main connection port but it also uses 20 and an upper unprivileged port.

RFC on FTP

Its not as straight forward as 20 and 21......two flavors of FTP (passive FTP or active FTP)
Good explanation in following link........

http://slacksite.com/other/ftp.html


Good luck
cheers

There is also TFTP, less used though.