Port 2352: Unassigned — A Registered Port with No Resident

What Range This Port Belongs To

Port 2352 falls in the registered ports range: 1024 through 49151.

This range sits between the well-known ports (0–1023), which are reserved for major protocols like HTTP, SSH, and DNS, and the dynamic/ephemeral ports (49152–65535), which operating systems assign temporarily to outbound connections.

Registered ports can be formally claimed by submitting a request to IANA, the organization that manages the global port number registry. Once registered, a port is associated with a specific service name and description. Port 2352 has no such registration — it appears in the IANA registry as unassigned.¹

The "pslserver" Label

Search for port 2352 and you'll find it listed as "pslserver" across a handful of port reference databases. There is no RFC for pslserver. There is no IANA registration for pslserver. There is no documentation explaining what pslserver does or who created it.

The label appears to have propagated through copy-paste between port reference sites, each citing each other, none sourcing an original specification. It is a ghost in the database — a name without a protocol.

Security Flags

Some security scanning tools flag port 2352 as historically associated with malware activity, meaning a trojan or malicious tool once used this port for communication.² This is not unusual. Malware authors regularly choose unassigned ports specifically because firewalls are less likely to block them and monitoring is less likely to notice.

A security flag on an unassigned port means: something used this once. It does not mean the port is inherently dangerous, or that traffic on it is necessarily malicious. It means you should look at what's using it if you find it open.

How to Check What's Listening on This Port

If port 2352 shows up open on your machine or network, these commands will tell you what process owns it:

macOS / Linux:

# See what's listening on port 2352
sudo lsof -i :2352

# Or with netstat
sudo netstat -tlnp | grep 2352

# Or with ss
sudo ss -tlnp | grep 2352

Windows:

# Show all listening ports with process IDs
netstat -ano | findstr :2352

# Match the PID to a process name
tasklist | findstr <PID>

If nothing is listening, the port is closed. If something is, the process name will tell you immediately whether it's expected software or something worth investigating.

Why Unassigned Ports Matter

The port number space has 65,535 slots. Most are empty. That's intentional.

When Tim Berners-Lee needed a port for HTTP, there was somewhere to put it. When the SSH designers needed a port after Ylonen built the protocol, port 22 was available. When new protocols are invented, unassigned ports are where they go.

An unassigned port is not wasted space — it's reserved capacity in a system that was designed to grow. The Internet's port registry is a commons: shared, finite, and maintained so that tomorrow's protocol can find a home.

Port 2352 is one of roughly 30,000 unassigned registered ports. It's waiting. So far, nothing legitimate has shown up to claim it.