Port 2826: slc-systemlog — A Name Without a Story

What Port 2826 Is

Port 2826 sits in the registered ports range (1024–49151), the middle tier of the port numbering system. Unlike the well-known ports below 1024 — which require elevated privileges to open and host recognizable services — registered ports are simply recorded by the Internet Assigned Numbers Authority (IANA) when an organization or developer claims them.

IANA's registry lists port 2826 as assigned to "slc-systemlog" on both TCP and UDP.¹ That's where the official record ends. There is no RFC defining the protocol, no technical documentation describing its wire format, no known implementation, and no clear explanation of what "slc" stands for. The name suggests some kind of system logging service — but so does half the Internet's underdocumented tooling.

This happens. Someone files an IANA registration, and then the project stalls, gets renamed, gets absorbed into something else, or just quietly stops. The registration stays on the books. The port sits empty.

The Registered Ports Range

Ports 1024–49151 exist in a different zone than the famous ports below them. Port 80 is HTTP. Port 443 is HTTPS. Port 22 is SSH. Everyone knows what's there.

The registered range is more like a land registry than a building directory. IANA records who claimed what, but "registered" doesn't mean "active" or "standardized." Many registered ports are used exactly as their registration says. Many others are used for entirely different purposes by software that never asked IANA's permission. And some — like 2826 — are registered to services that left no trace.

If This Port Is Open on Your System

If you see traffic on port 2826, it has nothing to do with "slc-systemlog." Something else is using it — possibly custom application software, a development server, or a service that picked an available port without consulting the registry.

To see what's listening:

macOS / Linux:

sudo lsof -i :2826
sudo ss -tlnp | grep 2826

Windows:

netstat -ano | findstr :2826

The process ID in the output will tell you exactly what has claimed the port.

Why Unassigned-in-Practice Ports Still Matter

When a port has a nominal registration but no real service, it becomes unclaimed territory in practice. That's mostly fine — registered ports aren't reserved in any hard sense. But it does mean that if you see port 2826 in a firewall log or a process list, you can't look it up and find a quick answer. You have to investigate.

That's the honest situation with 2826: officially spoken for, practically available, identity unknown.