Port 1824 is a registered port. IANA's registry lists it under the service name metrics-pas for both TCP and UDP. That's roughly where the official story ends — no RFC, no known implementation, no documentation explaining what "metrics-pas" actually is or was.
What "Registered" Means
Ports 1024 through 49151 are the registered range. Unlike the well-known ports below 1024 (which require root privileges to bind on most systems and carry protocols the entire Internet depends on), registered ports are claimed by applications and services through a request process. Anyone building software that needs a consistent port can ask IANA to assign one.
The catch: IANA records the name and the number, but it doesn't verify that the software ever shipped, that anyone uses it, or that the registrant still exists. The registry is a directory, not a census.
Port 1824 appears to be one of these orphaned entries — a name was registered, and then nothing followed.
Security Notes
Port 1824 has been flagged in some security databases as having historical trojan activity. This is worth understanding clearly: the flagging doesn't mean the port is inherently dangerous. It means that at some point, malware authors chose this port number for communication — likely because it was obscure and unlikely to be monitored. Any port can be used by any software, legitimate or otherwise. An open port 1824 on your system is worth investigating, not panicking about.
How to Check What's Using This Port
If you see port 1824 active on your machine, identifying it takes one command:
macOS / Linux:
Windows:
The process ID in the output maps to whatever software opened that socket. On Windows, you can cross-reference the PID in Task Manager. On macOS and Linux, lsof will show you the process name directly.
Why These Gaps Exist
The registered port range has 48,127 slots. Thousands are claimed, many are abandoned, some were never used. The system wasn't designed for perfect coverage — it was designed to reduce collisions between software that needs a predictable address. Port 1824 is a reminder that the registry is a historical artifact as much as a living map.
Frequently Asked Questions
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