Port 1692: sstsys-lm — A Registered Name, No Known Service

What This Port Is

Port 1692 sits in the registered ports range (1024–49151). IANA lists it under the service name sstsys-lm, assigned to a contact at ix.netcom.com — a dial-up ISP that was acquired and shut down in the late 1990s.

There is no RFC, no software documentation, and no known application that uses this service name. The registration is a relic.

What "Registered" Actually Means

The registered ports range contains over 48,000 port numbers. Any individual or organization could historically request a registration by submitting a form to IANA. The bar was low. Many registrations from the 1990s and early 2000s point to defunct companies, dead email addresses, and software that never shipped or was never publicly documented.

A registered port is not a used port. It means someone once asked IANA to list their name next to a number. Whether anyone implemented it, deployed it, or ever connected through it is a separate question entirely.

Port 1692 is one of many ports that are technically assigned but practically empty.

No Known Unofficial Uses

Port scans and security databases show no commonly observed unofficial services running on port 1692. It does not appear in threat intelligence databases as a common malware channel. It is, as far as any public record shows, unused.

How to Check What's Listening on Your System

If you see traffic on port 1692 and want to know what's generating it:

Linux / macOS:

sudo ss -tlnp | grep 1692
# or
sudo lsof -i :1692

Windows:

netstat -aon | findstr :1692

The process ID in the output can be matched against Task Manager or tasklist to identify the application.

If something is listening on port 1692 and you did not put it there, that is worth investigating. The port has no legitimate known service to hide behind.