Port 2943: TTNRepository — A Registration Without a Protocol

What Port 2943 Is

Port 2943 sits in the registered port range — numbers 1024 through 49151, governed by IANA, the organization that maintains the global registry of port assignments.

According to the IANA Service Name and Transport Protocol Port Number Registry, port 2943 is assigned on both TCP and UDP to a service called TTNRepository (service name: ttnrepository). The registrant is listed as Robert Orr at rorr@teltone.com.¹

Teltone Corporation was a Kirkland, Washington telecommunications equipment manufacturer. The company no longer appears to be active. No public documentation of the TTNRepository protocol survives — no RFC, no open-source implementation, no developer forum posts. The registration exists; the protocol does not appear to.

What the Registered Port Range Means

Ports 1024–49151 are "registered" ports. Unlike the well-known ports (0–1023), which require IANA assignment and system privileges to bind, registered ports are more loosely governed. An organization can request a registration from IANA, and if the port is available, IANA records it.

The registration doesn't mean the protocol is widely used, actively maintained, or even publicly documented. It means someone submitted a request at some point.

Port 2943 is a clear example of this. The name is in the registry. The protocol is, effectively, nowhere.

What You Might Actually Find on Port 2943

If you see traffic on port 2943 on your network, it is almost certainly not TTNRepository. More likely candidates:

• Custom application traffic — developers sometimes pick arbitrary registered ports for internal services
• Misconfigured software — an application defaulting to an unusual port
• Port scanning noise — automated scanners probe every port; detection doesn't mean use

How to Check What's Listening

On Linux or macOS:

sudo ss -tlnp | grep 2943
# or
sudo lsof -i :2943

On Windows:

netstat -ano | findstr :2943
# Then look up the PID:
tasklist | findstr <PID>

To check remotely:

nmap -p 2943 <target-ip>

If something is listening on 2943, your OS will tell you the process name. That's your real answer — not the IANA registry.

Why Empty Registrations Exist

The registered port range has thousands of entries. Some were submitted by major companies for protocols that became foundational infrastructure. Others were submitted by smaller teams for internal systems, proprietary appliances, or products that never shipped. When companies fold, get acquired, or simply lose interest, their port registrations don't disappear — they just sit there, pointing at nothing.

Port 2943 is one of those. The registration is a timestamp of an intention that didn't survive the company that held it.