Port 3419: Isogon SoftAudit — A Registered Port for a Vanished Product

What Port 3419 Is

Port 3419 sits in the registered ports range (1024–49151). These ports are assigned by IANA to specific applications and services, though registration doesn't guarantee the software is still in use — or even still exists.

Port 3419 is registered to Isogon SoftAudit, assigned in February 2002 to Per Hellberg on behalf of Isogon Corporation. Both TCP and UDP are registered.

Who Was Isogon?

Isogon Corporation was a New York-based software company that built tools for IBM mainframe environments. Their flagship product, SoftAudit for z/OS, did one thing: it tracked which software was actually running on mainframes and how often — helping large enterprises prove license compliance without overpaying for unused software.

In 2003, IBM acquired Isogon and folded SoftAudit into its Tivoli product line as IBM Tivoli License Compliance Manager for z/OS.¹ The port number stayed registered in IANA's database. The original product did not stay.

What This Range Means

Registered ports (1024–49151) require an application to request assignment from IANA. Unlike the well-known ports below 1024 — which govern foundational Internet infrastructure — registered ports are the territory of specific applications. Some are everywhere (port 3306 for MySQL, port 5432 for PostgreSQL). Most are like port 3419: quietly registered and rarely seen.

If You See Port 3419

You almost certainly won't. But if a security scanner flags activity on port 3419, it's not a known malware signature — check what's actually listening:

Linux/macOS:

sudo ss -tlnp | grep 3419
sudo lsof -i :3419

Windows:

netstat -ano | findstr :3419

Any process using this port today would be something local, not Isogon's software.

Why Registered Ports Matter

The registered port range exists so applications have predictable, conflict-free addresses. When Isogon registered port 3419 in 2002, they were staking a claim: "Our software lives here." That claim still exists in IANA's registry, even though the company and product have been gone for over two decades.

The registry doesn't expire. It doesn't clean house. Port 3419 will remain assigned to Isogon SoftAudit indefinitely — a small ghost in the machine.