What This Port Is
Port 3201 sits in the registered ports range (1024–49151), the middle tier of the port numbering system. These ports aren't reserved for core Internet infrastructure like the well-known ports below 1024, but they are registered with IANA to avoid collisions between software vendors.
Port 3201 is registered to CPQ-TaskSmart on both TCP and UDP.1
The Registered Service That Isn't
CPQ-TaskSmart was a Compaq product — a line of network-attached storage (NAS) appliances sold around 2000. The TaskSmart N-Series was among the first Windows Powered NAS devices on the market, supporting file sharing over CIFS, NFS, FTP, and HTTP.2
Compaq was acquired by HP in 2002. The TaskSmart product line is long discontinued. The IANA registration remains, unchanged, like a nameplate on an office door that nobody has bothered to take down.
In practice, this means port 3201 is functionally unassigned. No active software ecosystem uses this port for CPQ-TaskSmart. If you see traffic here, it isn't Compaq storage appliances from 2003.
Known Security Note
One documented vulnerability is worth knowing: a flaw in SAP Web Application Server (versions 6.40 before patch 136 and 7.00 before patch 66) allowed attackers to read arbitrary files via crafted data sent to port 3201 through enserver.exe.3 If you're running SAP and see activity on this port from unexpected sources, investigate.
What's Actually Listening Here
On any modern system, port 3201 is available for any application to claim. Developers sometimes use ports in the 3000–3300 range for local development servers. If you see activity on this port and don't know why, check directly:
macOS / Linux:
Windows:
The process ID in the output will tell you exactly what's using it.
Why Ghost Registrations Exist
The registered ports range is managed by IANA, but registrations don't expire automatically. When companies shut down, get acquired, or discontinue products, their port assignments stay in the registry indefinitely. This is a known limitation of how the port system works — it was designed to prevent collisions, not to reclaim abandoned space.
There are thousands of ports like 3201: technically claimed, practically available, historically interesting only to someone curious enough to look.
Frequently Asked Questions
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