What Port 3584 Is
Port 3584 sits in the registered ports range (1024–49151). Unlike the well-known ports below 1024 — where HTTP lives at 80 and SSH at 22 — registered ports require an organization to formally request an assignment from IANA, the Internet Assigned Numbers Authority. IANA records the name, the organization, and the date, then hands over the number.
Port 3584 was claimed in August 2002 by something called the U-DBase Access Protocol, abbreviated u-dbap. That's the entirety of the public record. No RFC was ever written describing the protocol. No implementation appeared in any open-source codebase. No product documentation surfaced. The organization that registered it left no trace on the modern Internet.
It is a ghost registration — the port equivalent of a business that filed incorporation paperwork and then closed before opening.
The Registered Port Range
Registered ports exist because the alternative is chaos. When two applications independently choose port 8080, traffic jams happen. IANA's registry is a coordination mechanism: file your claim, get a number that's officially yours.
The system has limits. IANA requires contact information and a brief description, but it doesn't require a working implementation, open documentation, or continued operation. Organizations that registered ports in the early 2000s sometimes registered defensively — staking claims on numbers they thought they'd need — and then never built the thing. The registry is full of these quiet claims.
Port 3584 is one of them. Officially occupied. Practically empty.
What You'll Find There in Practice
If you see port 3584 active on a system, it is not the U-DBase Access Protocol. There is no U-DBase Access Protocol, in any meaningful sense. What you're seeing is something else — an application that picked this number for its own reasons, or a misconfiguration, or a scan target.
Custom software sometimes lands on registered-but-unused ports deliberately, treating them as "safe" space that won't collide with anything important. This is technically correct and practically common.
How to Check What's Listening
On Linux or macOS:
On Windows:
The process ID returned by either command can then be looked up to identify the actual application. That's the answer that matters — not the IANA registry entry.
Why Ghost Registrations Matter
The IANA port registry is a coordination document, not a guarantor of activity. A registered port tells you one thing: someone once wanted this number. It tells you nothing about whether the protocol works, whether implementations exist, or whether the registering organization still exists.
For security scanning, this matters. A port scanner flagging 3584 as "u-dbap" is technically accurate and practically useless. The accurate read is: something is listening here, and the IANA label is not going to tell you what it is.
Investigate the process, not the label.
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