Port 1565 sits in a strange category: officially registered with IANA, but practically invisible. It has a service name (winddlb), a protocol designation (WinDD), and a registered contact from decades ago. But if you search for what WinDD actually does, you'll find almost nothing.
This is what happens to ports over time. Someone builds something, registers the port, and then the protocol fades away while the registration remains.
What We Know
According to IANA's official registry, port 1565 is assigned to:1
- Service name: winddlb
- Protocol: WinDD
- Transport: Both TCP and UDP
- Assignee: Kelly Sims (registered via garnet.wv.tek.com)
That's it. That's the extent of the official documentation.
What We Don't Know
What did WinDD stand for? Windows Device Discovery? Windows Dynamic Distribution? Something else entirely? The protocol name gives no hints, and no public documentation survives—if it ever existed.
Was this a proprietary protocol for a specific vendor's software? A failed standard that never gained adoption? An internal tool that somehow got an official port assignment? We don't know.
The email domain (garnet.wv.tek.com) suggests this came from Tektronix or a related organization in West Virginia, but even that trail goes cold.
The Registered Ports Range
Port 1565 falls in the registered ports range (1024-49151). These ports are assigned by IANA when someone requests them for a specific service. The process is documented in RFC 6335.2
To get a registered port, you submit an application to IANA, describe your protocol, and if approved, you get your assignment. That assignment stays in the registry indefinitely—even if the protocol dies, even if the contact email stops working, even if nobody remembers what the service was for.
This is why the registry contains thousands of ports like 1565: officially assigned, technically claimed, functionally forgotten.
Why This Matters
Unassigned or forgotten ports matter because they represent available space in a finite system. The Internet has 65,535 ports per protocol (TCP/UDP). Well-known ports (0-1023) are reserved for essential services. Dynamic ports (49152-65535) are temporary. That leaves registered ports (1024-49151) as the middle ground—officially assigned but not privileged.
When a registered port like 1565 is claimed but unused, it sits there in the registry while real protocols that need port numbers have to work around it. IANA can reclaim abandoned assignments, but often doesn't. The registry accumulates history like sediment.
Checking What's Actually Using Port 1565
Regardless of what WinDD was supposed to be, you can check what's actually listening on port 1565 on your system:
On Linux/Mac:
On Windows:
If something is listening, these commands will tell you what process owns it. Chances are, nothing will be there. WinDD, whatever it was, is gone.
The Ghost Ports
Port 1565 represents a category of ports we might call "ghost ports"—officially registered, technically assigned, but carrying nothing. They exist in the registry like abandoned buildings, their original purpose lost to time.
Every few hundred ports, you'll find one like this. A service name that means nothing. A contact email that bounces. A protocol that left no documentation, no source code, no trace except for its entry in IANA's records.
This is how infrastructure ages. The registry remembers what the Internet forgot.
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