Port 1392 has an official assignment: iclpv-pm, which stands for Print Manager.1 Both TCP and UDP. Registered with IANA. Everything proper and official.
And you've probably never encountered it.
What iclpv-pm Is
The details are sparse because the service never became widespread. Print Manager suggests it was designed to handle print job management—likely part of a larger printing solution from a vendor whose name has faded from common use.
No RFC. No widespread adoption. Just an entry in the IANA registry that proves someone, at some point, built something they thought would matter enough to request an official port number.
The Registered Port Range
Port 1392 sits in the registered port range (1024-49151). These ports are assigned by IANA to specific services upon request. Unlike well-known ports (0-1023), which are reserved for fundamental Internet services, registered ports are for applications that want an official number but don't need root privileges to bind to it.
The registered range is a catalog of intentions. Thousands of services requested official port assignments. Some became essential infrastructure. Most disappeared into obscurity. Port 1392 is one of the forgotten ones.
Security Considerations
Some security databases have flagged port 1392 in connection with malware activity.2 This doesn't mean the port itself is dangerous—it means that, like many rarely-used registered ports, it's sometimes appropriated by malware precisely because nobody's watching it.
An open port 1392 on your system is worth investigating. If you're not running print management software from decades past, you probably shouldn't see traffic here.
Checking What's Listening
To see if anything is using port 1392 on your system:
On Linux or macOS:
On Windows:
If something's listening and you don't recognize it, investigate. Legitimate use of port 1392 is rare enough that unexplained traffic warrants scrutiny.
Why Unassigned Ports Matter
Actually, port 1392 isn't unassigned—it has an official registration. But its obscurity illustrates something important: the registered port range is full of ghosts. Services that were built, assigned a number, and then faded away as the Internet evolved.
These ports matter because they show the history of networking—the ambitions that didn't pan out, the solutions that got replaced, the infrastructure that quietly disappeared. And they matter practically because their obscurity makes them attractive to attackers. Nobody monitors port 1392. Nobody expects traffic there. That makes it useful for hiding malicious activity.
The IANA registry isn't just a technical specification. It's an archaeological record of everything people tried to build on the Internet. Port 1392 is one of the layers buried deep.
Frequently Asked Questions About Port 1392
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