// REFERENCE
Port 21 (FTP)
Protocol: TCP
Service: FTP
High risk
The FTP control channel. It sends username and password in plain text, so it's a common target. Replace it with SFTP (over SSH, 22) or FTPS (990).
Related tools
Work with this in:
Related
20
Port 20 (FTP-DATA) 69
Port 69 (TFTP) 139
Port 139 (NetBIOS Session / SMB) 445
Port 445 (SMB) 873
Port 873 (rsync) 989
Port 989 (FTPS data)
Port 20 (FTP-DATA) 69
Port 69 (TFTP) 139
Port 139 (NetBIOS Session / SMB) 445
Port 445 (SMB) 873
Port 873 (rsync) 989
Port 989 (FTPS data)
Assignments per the IANA port registry. Educational content.