Port 3586: emprise-lsc — A Ghost in the Registry

What This Port Is

Port 3586 sits in the registered ports range (1024–49151). These ports aren't claimed by the operating system the way well-known ports (0–1023) are, but they're tracked by IANA, the organization that maintains the global port number registry.

According to that registry, port 3586 is assigned to emprise-lsc, described as "License Server Console," registered in August 2002 by James J. Diaz.¹

That's where the trail ends.

The Ghost Assignment

The registered ports range was, in the early 2000s, actively used by software companies to stake out numbers for their products. The process was relatively simple: you submitted a request, you got a number, your software used it. Thousands of companies did this.

Emprise was one of them. Their software apparently included a license server, and that license server had a console, and that console needed a port. So they registered 3586.

But Emprise is effectively gone. There's no current product, no active software, no community of users troubleshooting firewall rules for port 3586. The registration sits in the IANA database the way old property records sit in county archives, technically valid, practically irrelevant.

This is common. The registered ports range contains hundreds of these ghost assignments: ports tied to defunct companies, abandoned protocols, and software that stopped shipping before some of today's engineers were born.

What You'll Find on This Port in Practice

Almost certainly nothing assigned by Emprise. If you see traffic on port 3586, it's most likely:

• Ephemeral traffic from your own system using it as a temporary outbound port (operating systems pick from a range of available ports for outgoing connections)
• Custom software that chose this port because it appeared unclaimed in a casual survey
• Nothing at all

How to Check What's Listening

If you see port 3586 active on your machine and want to know why:

On Linux/macOS:

ss -tlnp | grep 3586
# or
lsof -i :3586

On Windows:

netstat -ano | findstr 3586

The output will show you the process ID. From there, you can identify the process and decide whether it belongs.

Why Ghost Ports Matter

When you're choosing a port for internal software, tools, or services, it's worth checking the IANA registry, but also worth understanding its limits. A port being "registered" doesn't mean the software is active. A port being "unassigned" doesn't mean no one uses it.

The real measure is: what's actually running in your environment? The registry is a historical record and a coordination mechanism, not a live map of what's running on any given network.