Port 3114: CCM AutoDiscover — A Reserved Name with Nowhere to Go

What Range This Port Belongs To

Port 3114 sits in the registered ports range (1024–49151). These ports are different from the well-known ports below 1024 in one important way: you don't need root or administrator privileges to open them. Any application can bind to port 3114 without special permissions.

IANA maintains this range as a registry — companies and developers can formally request a port assignment for their software. Getting registered doesn't mean you have to use it, and using a port doesn't mean you have to get registered. The registry is more of a courtesy agreement than an enforcement mechanism.

What Lives Here (or Doesn't)

Some port databases list port 3114 with the service name ccmad — short for Cisco CallManager AutoDiscover. Cisco CallManager (now Cisco Unified Communications Manager) is the enterprise VoIP platform that handles phone calls across corporate networks. AutoDiscover would let devices automatically find and connect to the CallManager server without manual configuration.

In practice, this registration appears to be dormant. Cisco's own port documentation for Unified Communications Manager doesn't surface port 3114 as an active requirement, and there's no RFC, no protocol specification, and no documented implementation that explains what ccmad actually does or how it works.¹

The Larson Network Print Server — a Windows printing management application — was also observed using this port in older versions (9.4.2 and earlier). Those same versions carried serious buffer overflow vulnerabilities, making port 3114 appear in security advisories for a product most people have never heard of.²

This is what the registered port range looks like up close: a mix of active protocols, quiet reservations, and software ghosts.

How to Check What's Listening

If you see traffic on port 3114 and want to know what's using it:

On Linux or macOS:

# Show what process is listening on port 3114
ss -tlnp | grep 3114
# or
lsof -i :3114

On Windows:

netstat -ano | findstr :3114

The PID in the output can be matched against Task Manager or tasklist to identify the process.

On a firewall or router, unexpected traffic to port 3114 from external sources is worth investigating. It isn't a commonly targeted port, but any open port is a potential surface.

Why Unassigned Ports Matter

The port numbering system works because there are agreements about what runs where. Port 443 is HTTPS everywhere. Port 22 is SSH everywhere. That predictability lets firewalls, load balancers, and monitoring tools make decisions without inspecting every packet.

The registered port range is where that predictability starts to fray. With over 48,000 ports available and no strict enforcement, the registry is full of overlapping claims, abandoned registrations, and informal conventions that differ across organizations.

Port 3114 is a small example of this: technically claimed, practically empty, occasionally repurposed by software that had no reason to pick this particular number. If you find it open on a server you manage and there's no deliberate reason for it, close it.