What Port 3524 Is
Port 3524 sits in the registered ports range (1024-49151). These ports are assigned by IANA upon request, distinguishing them from the well-known ports below 1024 (which require root privileges on Unix systems) and the ephemeral ports above 49151 (which operating systems assign dynamically for outgoing connections).
IANA lists port 3524 as ecmport on both TCP and UDP, described simply as "ECM Server port."1 That's where the official record ends.
What ECM Means Here
ECM typically stands for Enterprise Content Management. These are systems that manage documents, records, and digital assets at scale. Several ECM platforms exist: IBM FileNet, Alfresco, OpenText, Agilent's OpenLab ECM for laboratory data. Which of these, if any, originally registered port 3524 with IANA is unclear. No RFC documents the protocol. No vendor documentation visibly references this port number.
The registration exists. The software that prompted it has either faded from common use, adopted different ports, or simply never achieved wide deployment.
Why This Happens
Registering a port with IANA is not difficult. An organization submits a request, provides a contact, describes the service, and IANA adds an entry. There is no requirement that the software ever ship, gain users, or leave any footprint. Thousands of registered ports belong to software that was abandoned, superseded, or that never launched.
Port 3524 appears to be one of these. It has a claim in the registry but no observable presence on the Internet.
How to Check What's Listening on This Port
If you see traffic on port 3524 or want to know if something on your machine is using it:
On Linux or macOS:
On Windows:
To identify a process by PID (Linux/macOS):
If something is listening on port 3524, it's almost certainly not "ECM Server port" in any meaningful sense. It's more likely a local application that picked this port because it was available, a development server, or a misconfiguration worth investigating.
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