Port 922: Unassigned — A numbered door with no protocol behind it

Port 922 is officially unassigned. It has no designated protocol, no RFC defining its purpose, no service waiting to answer when a packet arrives.

The Well-Known Port Range

Port 922 falls within the well-known ports (0-1023), also called system ports¹. These are the ports assigned by IANA—the Internet's central registry—for protocols important enough to deserve a permanent, universal address.

SMTP got port 25. HTTP got port 80. SSH got port 22. Port 922 got nothing.

IANA marks ports 914-952 as unassigned². This entire range sits empty in the official registry, reserved but unclaimed. These aren't forgotten—they're deliberately held open for future protocols that might need a well-known address.

Most will probably stay empty forever.

Why Unassigned Ports Matter

Every unassigned port in the well-known range represents a deliberate choice. IANA could assign them tomorrow if the right protocol came along with the right justification. But the bar is high. Getting a well-known port requires:

• A protocol important enough to need universal recognition
• An RFC or standards-track specification
• IETF review and approval
• A reason it can't use the registered ports range (1024-49151) instead

The scarcity is intentional. Only 1,024 well-known ports exist. Once they're gone, they're gone.

What Might Be Using Port 922

Just because a port is officially unassigned doesn't mean nothing uses it. Any application can listen on any port. You might find:

• Custom applications configured to use port 922 for internal services
• SSH servers moved from port 22 to reduce automated attacks (some administrators choose port 922 as an alternate SSH port, though it has no official status)
• NetBIOS services, though these should never be exposed to the public Internet³
• Nothing at all—the most common case

If you see traffic on port 922, it's worth investigating. It's not supposed to be there, which makes it interesting.

How to Check What's Listening

On Linux or macOS:

# See what's listening on port 922
sudo lsof -i :922

# Or with netstat
sudo netstat -tulpn | grep :922

# Or with ss
sudo ss -tulpn | grep :922

On Windows:

# See what's listening on port 922
netstat -ano | findstr :922

If nothing returns, the port is closed—exactly as it should be for an unassigned port.

The Empty Spaces

The Internet's port system has 65,536 addresses. Most go unused. The well-known range has hundreds of unassigned ports. The registered range (1024-49151) has thousands more.

These aren't wasted. They're available. Ready for the next protocol that needs a home.

Port 922 waits, numbered but nameless, a door with no service behind it.

For now.