Port 1582 is officially registered with IANA for a service called MSIMS. The registration was made by Glenn Olander, with the contact email gjo@msi.com.1 The port operates on both TCP and UDP protocols.
That's where the certainty ends.
The Mystery Service
No public documentation exists explaining what MSIMS does, what it stands for, or what systems actually used it. The registration is old enough that the context has been lost to time. The email domain still exists, but the service itself appears to have vanished—if it ever saw widespread deployment at all.
This isn't uncommon. The IANA port registry contains thousands of entries from the 1980s and 1990s—services registered by companies and developers whose protocols never achieved adoption, or whose software disappeared when the company folded. Port 1582 is one of these ghosts: officially claimed, technically assigned, but functionally unknown.
The Malware Connection
What port 1582 became known for wasn't MSIMS—it was malware. Security databases flag both TCP and UDP 1582 as ports that have been used by trojans and viruses to communicate.23 This doesn't mean the port is inherently dangerous. It means that at some point, malicious software decided to use an obscure, little-monitored port for command-and-control traffic.
This is the irony of abandoned registrations: they become targets precisely because nobody's watching them. A legitimate service on port 443 generates expected traffic. A service on port 1582 generates suspicion, because why would anything be talking on a port nobody uses?
What Range This Port Belongs To
Port 1582 falls in the registered ports range (1024-49151). These ports are assigned by IANA to specific services upon application. Unlike well-known ports (0-1023), which require root privileges to bind on Unix systems, registered ports can be used by ordinary user processes.
The registration system was meant to prevent conflicts—if your software needs a port, you register it, and nobody else uses that number for their protocol. But the system assumed services would document themselves, that protocols would be published, that the Internet would remember.
For MSIMS, the Internet forgot.
How to Check What's Listening on Port 1582
If you want to see whether anything on your system is using port 1582, you can check with standard network tools.
On Linux or macOS:
On Windows:
If something is listening on port 1582 and you don't recognize it, that's worth investigating. Legitimate modern software rarely uses this port. If you find it open, it's either legacy software from decades ago, or something that shouldn't be there.
Why Unassigned (and Forgotten) Ports Matter
Port 1582 isn't technically unassigned—it has a name in the registry. But functionally, it's orphaned. And orphaned ports matter because they represent gaps in our collective knowledge of the Internet's infrastructure.
Security monitoring assumes we know what normal traffic looks like. When a port has no known legitimate use, any traffic becomes suspicious. When a port has a registration but no documentation, you can't distinguish between "forgotten software still running" and "malware pretending to be forgotten software."
The IANA registry was supposed to be a map of the Internet's nervous system. For well-known ports like 80 and 443, it is. For ports like 1582, it's more like a cemetery—names on stones, but the stories buried with the dead.
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