Port 1459: Proshare1 — A Ghost in the Registry

Port 1459 belongs to the registered ports range (1024–49151), where IANA officially assigns port numbers to specific applications and services. This port is registered to proshare1, part of Intel's Proshare Notebook Application.¹

What Proshare Was

Proshare was Intel's collaboration software suite from the early 1990s—video conferencing, shared whiteboards, application sharing. The kind of thing that seemed futuristic in 1992 and became standard in 2020. The Notebook Application was one component of this suite, designed for shared note-taking and document collaboration during video calls.

The software is long dead. Intel discontinued Proshare in the late 1990s. But the port registration remains.

The Lifecycle of a Port Registration

When IANA assigns a port number, that assignment doesn't automatically expire when the software disappears. Port 1459 is still officially allocated to proshare1, even though:

• The software hasn't existed for over 20 years
• No modern system would recognize this port
• The company that made it (Intel) has long since moved on

This is normal. The port registry is full of ghosts—services that mattered once, got their port number, and then faded while their registration persisted.

What Actually Uses This Port

Some sources claim port 1459 is used for IRC (Internet Relay Chat) connections.² This is likely confusion with RFC 1459, the document that defined the IRC protocol. The standard IRC ports are 6667 (plain text) and 6697 (TLS/SSL)—not 1459.³

In practice, port 1459 is effectively unassigned. You could run anything on it. The official registration is a formality that nobody enforces.

The Registered Ports Range

Port 1459 sits in the middle of the registered ports range (1024–49151). These ports require IANA registration, but the process is lighter than for well-known ports (0–1023). You submit an application, demonstrate that you're running a real service, and if approved, the port is yours.

Or was yours. Even if your software vanishes.

Checking What's Listening

If something is using port 1459 on your system, it's not Proshare. To find out what it actually is:

Linux/macOS:

sudo lsof -i :1459
sudo netstat -tulpn | grep 1459

Windows:

netstat -ano | findstr :1459

The output will show the process ID and program name. It won't be Proshare—unless someone built a museum exhibit.

Why This Matters

Unassigned and zombie-registered ports like 1459 are useful precisely because nobody's using them. Developers testing new protocols often choose ports in this range. Security researchers analyzing network traffic look for activity on unexpected ports. A connection attempt to port 1459 might be:

• Custom software using an arbitrary port
• A scanning tool probing for open services
• Malware using an uncommon port to avoid detection

The port is empty. That makes it interesting.

The Real Story

Port 1459 is a reminder that the Internet has a memory, but not an intelligent one. When Intel registered this port in the early 1990s, Proshare seemed important enough to claim a permanent spot in the global port registry. The software failed. The registration didn't.

Thousands of ports are like this—reserved for services that nobody remembers, products that companies stopped supporting, protocols that never caught on. They sit in the registry, technically allocated, functionally available.

The Internet doesn't clean up after itself. It just keeps growing.