What Range This Port Belongs To
Port 2889 sits in the registered ports range (1024–49151). This range exists between the well-known ports (0–1023, reserved for foundational protocols like HTTP and SSH) and the ephemeral ports (49152–65535, used temporarily by operating systems for outgoing connections).
Registered ports are supposed to mean something. Any software vendor or developer can apply to IANA to formally claim a port for their service. In theory, this prevents conflicts — two applications accidentally competing for the same port. In practice, it creates a registry full of entries where the software has long since vanished, the contact has moved on, and the name is all that remains.
Port 2889 is one of those entries.
The RSOM Registration
IANA shows port 2889 registered for a service called RSOM on both TCP and UDP, with a contact named Justine Higgins.1
That's essentially all that's known. No RFC defines RSOM. No documentation explains what it does. No open-source project, vendor product, or forum discussion appears to use it. The acronym itself doesn't map to anything in common networking terminology.
It's a name in a database without a referent in the world. Someone filed the paperwork. Then RSOM disappeared — or perhaps it was always internal, a proprietary service that never left its original network.
Is Anything Actually Using This Port?
Possibly — just not anything public. Private applications frequently use registered ports for internal communication, especially enterprise software. If you see traffic on port 2889 on your network, it's more likely a proprietary application than RSOM itself.
To check what's listening on this port on your own machine:
Linux / macOS:
Windows:
If nothing appears, nothing is using it — which for port 2889 is probably the most common result.
Why Unassigned (and Ghost) Ports Matter
The IANA registry exists to prevent collisions. If every developer picked ports at random, two pieces of software would inevitably collide on the same number, and you'd spend hours debugging why your application can't start because something else grabbed its port first.
Ghost registrations like port 2889's RSOM entry are a quiet problem. The port is technically "taken," which discourages other software from using it — but the software that claimed it either doesn't exist publicly or has been abandoned. The port sits in limbo: reserved on paper, empty in practice.
For you, this means: if you need a port for a personal project or local service, port 2889 is unlikely to conflict with anything. But check first. The answer on your specific machine is always lsof or netstat, not a registry entry.
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