Port 1924: Unassigned — a number without a name

What Range This Port Belongs To

Port 1924 falls in the registered port range: 1024 to 49151.

IANA (the Internet Assigned Numbers Authority) manages this range. Unlike the well-known ports below 1024 — which require root privileges on Unix systems and carry decades of protocol history — registered ports are available to any application that formally requests an assignment. You submit a form, describe your service, and if approved, your protocol gets a number.¹

Most of the 48,128 slots in this range have never been claimed. Port 1924 is one of them.

What Uses Port 1924

Nothing, officially. IANA lists port 1924 as unassigned for both TCP and UDP.²

There's no widely known unofficial application that has settled here. Some port databases flag it with generic malware warnings — this is standard boilerplate applied to nearly every unassigned port, not evidence of actual observed threats. No specific trojan or exploit tool is known to use 1924 as its default.

If you see traffic on port 1924 on your network, it's almost certainly one of three things:

• A custom internal application that chose this port arbitrarily
• A service using a non-default configuration
• Something worth investigating

How to Check What's Listening

To see if anything on your machine is bound to port 1924:

On Linux or macOS:

ss -tlnp | grep 1924
# or
lsof -i :1924

On Windows:

netstat -ano | findstr :1924

If something appears, the process ID will let you identify it:

Linux/macOS:

# lsof will show the process name directly
# for ss, use the PID from the output:
ls -la /proc/<PID>/exe

Windows:

tasklist | findstr <PID>

Why Unassigned Ports Matter

The port system only works because it's predictable. When you type a web address, your browser knows to try port 443 without asking. When you SSH into a server, your client tries port 22. The entire convention depends on services being where you expect them.

Unassigned ports are the system's slack. They're available territory for custom services, internal tools, and future protocols. Some become de facto standards through widespread adoption before ever receiving a formal IANA assignment. Others sit empty forever.

Port 1924 is in the second category. It's not broken or dangerous by nature. It's just unclaimed — a number on the map where no town was ever built.