What are the port numbers for FTP?

FTP = ports 21 (control) and 20 (data), both TCP.

FTP = Ports 20 and 21 (TCP)

• Port 21: Control channel (commands, authentication)
• Port 20: Data channel (actual file transfers in active mode)

Memory tip: "21 = talk (control/commands), 20 = transfer (data)" - you connect on 21 first, then data flows on 20.

Security note: FTP sends credentials in plaintext. Use SFTP (over SSH, port 22) or FTPS instead.

Go deeper:

• File Transfer Protocol — Wikipedia overview confirming TCP port 21 for control and 20 for data.
• List of TCP and UDP port numbers — the broader lookup table placing 20/21 among the well-known ports.