# ProtocolLab HQ

HTTP codes Ports

TCP Port

587 SMTP submission

The standard port for email clients to submit outgoing mail with STARTTLS encryption and authentication.

Protocol: TCP · Port: 587

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.