Port 20 — FTP-Data

TCP · Port 20/TCP is used for the transfer of data in File Transfer Protocol (FTP) sessions, allowing clients to upload and download files. This port plays a crucial role in ensuring secure file sharing by encrypting sensitive data during transmission.

Port Number: 20
Service Name: FTP-Data
Protocol: TCP
Common Software: vsftpd, ProFTPD

Security Notes

Review IANA registry for port 20 usage. Apply principle of least privilege - only open ports that are required.

FAQ

What is port 20 used for?

Port 20 is used for FTP-Data. Port 20/TCP is used for the transfer of data in File Transfer Protocol (FTP) sessions, allowing clients to upload and download files. This port plays a crucial role in ensuring secure file sharing by encrypting sensitive data during transmission. Common software: vsftpd, ProFTPD.

Is port 20 dangerous to leave open?

Review IANA registry for port 20 usage. Apply principle of least privilege - only open ports that are required.

How do I check if port 20 is open?

Use nmap: nmap -p 20 <target> or check locally: ss -tlnp | rg 20