Port 1567 sits in the registered ports range (1024-49151), officially claimed by IANA for a service called jlicelmd—presumably a license management daemon. But here's the strange part: despite being registered, almost no modern documentation explains what software actually uses it or who maintains it.
What Range This Port Belongs To
Port 1567 is a registered port. The port number space is divided into three ranges:
- Well-known ports (0-1023): Reserved for system services and require root privileges
- Registered ports (1024-49151): Registered with IANA for specific services upon application
- Dynamic/ephemeral ports (49152-65535): Available for temporary use by client applications
Port 1567 falls in the middle category. Someone, at some point, applied to IANA and claimed this port for jlicelmd. The registration was approved. And then... the trail goes cold.
What jlicelmd Is (Probably)
Based on the name, jlicelmd appears to be a license management daemon—the kind of background service that enforces software licensing for commercial applications. License daemons run on a server and manage floating licenses, allowing a certain number of users to run software simultaneously across a network.1
The "lmd" suffix suggests "license management daemon." The "jlice" prefix might indicate a specific vendor or product line, but modern search results turn up almost nothing about what software actually uses port 1567 or who developed jlicelmd.
It's registered. It's named. But it's effectively forgotten.
Why This Matters
Registered ports like 1567 represent a curious phenomenon: bureaucratic permanence outliving technical relevance.
When software dies—when companies fold, products get discontinued, or technologies become obsolete—the port numbers they registered don't automatically get released. They stay claimed in the IANA registry, potentially for decades, even if nothing uses them anymore.
This isn't necessarily bad. Port numbers are cheap—we have over 48,000 registered ports available. But it does mean that the port registry functions partly as an archaeological record of software that once existed.
How to Check What's Listening on This Port
If you want to see whether anything is actually using port 1567 on your system:
On Linux or macOS:
On Windows:
If something is listening, you'll see the process ID and can investigate further. More likely, you'll see nothing—because whatever jlicelmd was, it's probably not running on your network.
The Ghost Ports
Port 1567 is one of thousands of registered ports that exist in a kind of limbo. Not actively used by major services. Not completely forgotten. Just... claimed. Waiting.
Maybe somewhere, on a legacy system in a data center that hasn't been upgraded since the early 2000s, jlicelmd is still running. Maybe some old CAD software or engineering application still uses it for license management. Or maybe it's completely dead, and the only evidence it ever existed is this entry in the IANA registry.
Either way, port 1567 is a reminder: the Internet remembers. Even when we forget.
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