Port 3072: ContinuStor Monitor — Registered but Forgotten

What Port 3072 Is

Port 3072 is officially assigned. IANA's registry lists it as csd-monitor — the ContinuStor Monitor Port — registered to NetApp in July 2014, on both TCP and UDP.¹

In practice, almost no one is running ContinuStor. The product is obscure enough that most port reference databases still list 3072 as unassigned. If you encounter this port open in the wild, the odds that it's ContinuStor are low.

What ContinuStor Was

ContinuStor was a NetApp storage monitoring component — part of the machinery that watches over enterprise storage systems, tracking health and performance. NetApp acquired and folded various storage products over the years; ContinuStor is one of the quieter corners of that history.

The registered service name csd-monitor suggests it was used for continuous storage daemon monitoring — a background process checking in on storage device status. Port 3072 would carry that telemetry.

The Trojan That Got Here First

Here's where it gets interesting: an IRC bot trojan was documented using port 3072 in 2002 — twelve years before NetApp registered the port with IANA.²

This is a pattern worth understanding. IANA registration doesn't mean exclusive use. Anyone can bind to any port. The registry is a coordination mechanism, not enforcement. A piece of malware from the early 2000s used 3072 for command-and-control communications, and it has nothing to do with the storage monitoring software that came later.

What Range This Port Lives In

Port 3072 is a registered port — in the range from 1024 to 49151. This range exists for applications to request official assignments, so that software vendors don't step on each other. Below 1024 are the well-known ports (HTTP, SSH, SMTP). Above 49151 are ephemeral ports — temporary, assigned by the OS for outbound connections.

Registered doesn't mean active. It means someone filed the paperwork.

If You See Port 3072 Open

Finding port 3072 listening on a system is almost certainly not ContinuStor. It could be:

• A custom application that chose this port arbitrarily
• A development server bound to a random high port
• Something you should investigate

To check what's listening:

Linux / macOS:

# Show which process is using port 3072
ss -tlnp | grep 3072
# or
lsof -i :3072

Windows:

netstat -ano | findstr :3072
# Then look up the PID in Task Manager

The process name will tell you whether this is expected software or something that warrants a closer look.