Port 2999: RemoteWare Unassigned — A Reserved but Empty Port

What Range This Port Belongs To

Port 2999 is a registered port — one of the 48,128 ports in the range 1024 to 49151 that IANA manages on behalf of software vendors and protocol designers. This range is sometimes called User Ports.

Registered ports aren't reserved for exclusive use the way well-known ports (0-1023) are. Any application can bind to port 2999 without conflict — the registration just signals that IANA has acknowledged a vendor's claim to associate that number with a named service.

The RemoteWare Connection

IANA lists port 2999 under the service name remoteware-un, which stands for RemoteWare Unassigned.¹

RemoteWare was enterprise software for remote device management and data synchronization — the kind of product that lets a company push updates to thousands of field devices over unreliable network connections. The software registered a block of ports with IANA. Most ports in the block got assigned to specific functions within the product. Port 2999 didn't. The "Unassigned" in the name is the vendor's own designation — they claimed the port, then left it empty.

The neighboring ports tell the story:

• Port 2996 — remoteware-srv — RemoteWare server
• Port 2997 — remoteware-cl — RemoteWare client
• Port 2998 — remoteware-p2 — RemoteWare peer-to-peer
• Port 2999 — remoteware-un — RemoteWare Unassigned

Port 2999 is the end of the block, a parking spot that was never filled.

No Known Unofficial Uses

Port 2999 has no widely observed unofficial uses. It doesn't appear in common malware databases, isn't associated with any popular open-source project, and doesn't show up as a default port for any broadly adopted service. It's genuinely quiet.

How to Check What's Listening on This Port

If you want to see whether anything on your system is using port 2999:

macOS / Linux:

lsof -i :2999

Windows:

netstat -aon | findstr :2999

If nothing is listening, you'll see no output. If something is, lsof will show you the process name and PID directly. On Windows, cross-reference the PID against Task Manager.

Why Empty Ports Matter

The registered port space is finite and the registration process is real work — vendors submit applications, IANA reviews them, assignments persist in the registry for decades. Port 2999 is a small reminder of what happens at the edges of that system: vendors sometimes register more than they need, products evolve in different directions, and the original allocation outlives its purpose.

That's not a flaw. Empty registered ports create breathing room. When an application needs a port and reaches for something in the registered range that happens to be unused, port 2999 is the kind of candidate that shows up — claimed on paper, available in practice.