# ProtocolLab HQ

HTTP codes Ports

TCP Port

21 FTP control

File Transfer Protocol command/control channel. Unencrypted; largely superseded by SFTP and FTPS.

Protocol: TCP · Port: 21

ProtocolLab HQ — HTTP codes and ports, looked up fast.

A quick developer reference for HTTP status codes and common network ports, compiled from the relevant RFCs and IANA registries. Port assignments and status semantics occasionally change; check the current standard when it matters.