Port 1143 sits in the registered ports range with an official service name—"imyx" for "Infomatryx Exchange"—but that's about all anyone knows. There's no RFC describing it. No documentation explaining what it does. No evidence it was ever widely deployed.
It's a ghost in the registry. A port number assigned to a service that either never launched or disappeared so completely that the Internet forgot it existed.
What Is Port 1143?
Port number: 1143
Service name: imyx (Infomatryx Exchange)
Protocol: TCP/UDP
Range: Registered ports (1024-49151)
Status: Officially assigned by IANA, functionally unknown
Port 1143 falls in the registered ports range—the section of port numbers (1024-49151) that organizations can request from IANA for specific services. Someone applied for this port, provided a service name, and got the assignment. Then the trail goes cold.
The Registered Ports Range
When port 1143 was assigned, it joined the middle tier of the port number system:
Well-known ports (0-1023): Reserved for common services like HTTP (80), HTTPS (443), SSH (22). Require administrative privileges to listen on most systems.
Registered ports (1024-49151): Assigned by IANA to specific services upon request. Port 1143 is here. Organizations submit applications describing their service, and if approved, they get a port number. But assignment doesn't guarantee the service will succeed—or even launch.
Dynamic/ephemeral ports (49152-65535): Never assigned to specific services. Used temporarily by client applications when connecting to servers.
Port 1143 has official status but no observable presence. It's registered but not recognized. Listed but not used.
What Is Infomatryx Exchange?
That's the question. The service name "imyx" stands for "Infomatryx Exchange," but what that means is unclear. No public documentation describes the protocol. No company website explains the service. No RFC defines how it works.
The most likely explanation: Infomatryx Exchange was a planned service that never launched, or a proprietary protocol used internally by an organization that's since shut down. The port assignment remains, but the service is gone.
This happens more often than you'd think. The IANA registry is full of ports assigned to services that disappeared decades ago, leaving only a service name and a number behind.
How to Check What's Listening on Port 1143
Even though the official service is unknown, any application can listen on port 1143. On Unix-like systems:
On Windows:
If something's listening, you'll see it. But chances are, port 1143 is quiet. A registered address with no one home.
Why Unassigned (or Forgotten) Ports Matter
The port number system has 65,535 addresses. Only about 500 are truly well-known. The rest are either registered to obscure services, unassigned, or sitting in the dynamic range.
Ports like 1143 matter because they show the history of the Internet—not just the successes, but the experiments that didn't work out. Services that were planned but never shipped. Protocols that someone cared enough to register but not enough to document.
They're also a reminder that port assignment isn't forever. A service can have an official port and still disappear. The number remains, but the meaning is lost.
What to Do with Port 1143
If you're building a service and need a port number, don't use 1143. It's registered, even if the service is forgotten. Pick a port from the dynamic range (49152-65535) for testing, or apply for your own registered port if you're deploying something official.
If you see traffic on port 1143, investigate. It might be a legacy system running Infomatryx Exchange (whatever that is), or it might be malware using an obscure port hoping no one will notice.
Most likely, you'll never see port 1143 in use. It's a number in a registry, assigned to a service no one remembers, waiting for a protocol that isn't coming back.
Frequently Asked Questions About Port 1143
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