Port 1932: CTT Broker — A Name Without a Story

What Port 1932 Is

Port 1932 sits in the registered port range (1024–49151). These ports are assigned by IANA through a formal review process — companies and developers can claim a port for their service, and IANA records the assignment.

The official IANA entry for port 1932 reads: ctt-broker, over both TCP and UDP.¹

That's where the trail ends.

The CTT Broker Mystery

"CTT Broker" has no public RFC. No specification. No documentation that explains what CTT stands for, what the broker negotiates, or whether the service ever shipped in any product. The name is registered. The service is a ghost.

This happens more than you'd think. The registered port range has over 48,000 slots. Some were claimed by companies that later folded. Some were reserved for products that never shipped. Some are internal enterprise services that were registered once and then never discussed publicly. Port 1932 appears to be one of these.

It's not malicious — just quiet. The Internet has a lot of doors that were built but never opened.

What Range This Port Belongs To

Registered ports (1024–49151) are the middle tier of the port number system:

• Well-known ports (0–1023): Reserved for fundamental Internet services — HTTP (80), HTTPS (443), SSH (22). Require elevated privileges to bind on most systems.
• Registered ports (1024–49151): Claimed by applications through IANA. No privilege required to use them. No guarantee the registered service is what's actually running.
• Dynamic/ephemeral ports (49152–65535): Not registered. Used temporarily for outgoing connections.

Port 1932 is registered, but registration doesn't mean enforcement. Any application can open any port. The registry is a courtesy system.

If You See Port 1932 Open

If a port scanner shows something listening on 1932, it's almost certainly not "CTT Broker" — it's whatever application on that system decided to use this port. Common reasons:

• A development server using an arbitrary port
• An internal tool that picked a number in this range
• A database, proxy, or custom service configured to listen here

To find out what's actually running:

On Linux/macOS:

# Show what process is listening on port 1932
sudo lsof -i :1932

# Alternative using ss
sudo ss -tlnp | grep 1932

On Windows:

# Show process using port 1932
netstat -ano | findstr :1932

# Then look up the PID
tasklist | findstr <PID>

Why Unassigned and Ghost Ports Matter

The port registry is a map, not a law. Knowing that a port has a name tells you what should be there. Knowing what's actually there requires checking the host directly.

Ghost registrations like port 1932 are useful in one way: if something is running on this port and you didn't put it there, you have no historical context to dismiss it. There's no legitimate service to confuse it with. An unexpected listener on 1932 is worth investigating.