What Port 3575 Is
Port 3575 sits in the registered port range (1024–49151). These ports are assigned by IANA to specific applications and services upon request, distinct from the well-known ports (0–1023) that are reserved for foundational Internet protocols.
IANA lists port 3575 under the service name ccm-port, described as "Coalsere CCM Port," registered for both TCP and UDP. 1
The Problem: Coalsere Has Vanished
Coalsere — the company that registered this port — appears to have no surviving web presence. No product pages. No documentation. No forum posts from users troubleshooting their CCM installation. The registration exists; the company does not, at least not visibly.
This happens more often than you'd expect. The registered port range reflects decades of software history. Companies registered ports, shipped products, and then merged, pivoted, or shut down — leaving their port assignments as fossils in the IANA registry.
Port 3575 is one of those fossils. Whatever Coalsere's CCM (the acronym is unspecified — Command Management? Configuration Control?) was built to do, it isn't doing it publicly anymore.
What This Means in Practice
If you're seeing traffic on port 3575 on your network, it's almost certainly not Coalsere software. More likely candidates:
- A custom application that chose this port arbitrarily
- A misconfigured service
- A game or peer-to-peer application using it as an ephemeral channel
- Malware probing for open ports (port scanners often sweep through registered ranges)
How to Check What's Listening
On Linux or macOS:
On Windows:
The output will show the process ID. Cross-reference with your process list to identify what's actually using it.
Why Orphaned Ports Matter
The registered port range has thousands of entries like this — ports claimed by products that never achieved wide adoption or by companies that no longer exist. This creates ambiguity. A firewall rule that blocks "Coalsere CCM" is blocking a ghost. A security tool that flags port 3575 as suspicious is reacting to a name in a registry with no attached reality.
The practical rule: don't trust the IANA label alone. Trust what lsof or ss tells you about what's actually listening.
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