Port 2859: Active Memory — A Registered Name Without a Story

What This Port Is

Port 2859 sits in the registered ports range (1024–49151) and carries an official IANA registration: service name activememory, described as "Active Memory," assigned to both TCP and UDP.¹

That's where the paper trail ends.

Whatever "Active Memory" was — a product, a protocol, an internal service someone planned to ship — it never generated public documentation, RFC references, or visible deployment on the Internet. IANA has the reservation. The rest is silence.

The Registered Port Range

Ports 1024 through 49151 are registered ports. Unlike the well-known ports below 1024 (which are tightly controlled and universally recognized), the registered range operates more like a reservation system: an organization requests a port for a specific service, IANA records it, and then the world moves on.

In practice, this produces two kinds of registered ports:

• Ports with lives — SSH alternative on 2022, MySQL on 3306, PostgreSQL on 5432. These have active deployments, documentation, and communities.
• Ports with names — Entries in the registry attached to products that never shipped, companies that folded, or internal tools that never needed a public footprint. Port 2859 appears to be one of these.

Neither type is wrong. The registry is not a hall of fame. It's a directory, and directories have vacancies.

If You See Traffic on Port 2859

Because this port has no active, known service, traffic here is worth examining. It could be:

• Application-specific — Custom software using an available port that happens to match this registration
• Scanning or probing — Automated network scanners often sweep registered ports looking for open listeners
• Malware — Some malicious software uses obscure registered ports specifically because they attract less attention

The "registered" label confers no safety guarantee. An unknown open port is worth investigating regardless of its IANA status.

How to Check What's Listening

macOS / Linux:

# Show what process is listening on port 2859
sudo lsof -i :2859

# Or with netstat
netstat -an | grep 2859

Windows:

netstat -ano | findstr :2859

The output will show the process ID (PID). Cross-reference it with Task Manager or ps aux to identify the application.