Port 2250 sits in the registered port range (1024–49151). These ports are assigned by the Internet Assigned Numbers Authority (IANA) to specific services and applications, distinguishing them from the well-known ports (0–1023) reserved for foundational protocols like HTTP, SSH, and DNS.
The IANA registry lists port 2250 as "remote-collab" on both TCP and UDP.1 That is the entirety of the official record. No RFC. No documentation. No company or developer associated with the registration. No known software that uses it.
This happens more often than you'd expect. The registered range has thousands of entries — some are thriving protocols, some are applications that were built and abandoned, and some appear to be names that were reserved but never developed. Port 2250 seems to fall into the last category.
What "Registered" Actually Means
Being in the registered range doesn't mean a port is actively used. It means someone, at some point, submitted a request to IANA claiming that name and number. Registration is not endorsement. It's not a guarantee the service exists. It's closer to staking a claim — and claims can go unclaimed.
The practical upshot: if you see traffic on port 2250, it's almost certainly something specific to your environment — an application that chose this port for its own reasons, a configuration that landed here by default, or a misconfiguration. It is not a recognized standard.
How to See What's Using It
If port 2250 is open on a machine you manage, you can identify what's listening:
On Linux or macOS:
On Windows:
The output will show the process ID. From there, you can look up the process name and trace it back to the application.
Why Unassigned-in-Practice Ports Matter
Port numbers are a finite resource — 65,535 of them, shared across every protocol and application on the Internet. The registered range is meant to prevent collisions: two applications accidentally using the same port and interfering with each other. But the system only works when registrations are maintained and documented.
Ports like 2250 — registered but mysterious — are a mild form of namespace pollution. They hold a number without providing any value, and they make it harder to reason about what traffic on that port might mean.
If you're a developer choosing a port for an internal service, avoid registered ports with no documentation. You can't know whether some future application will legitimately claim the name, and if it does, you'll have a collision on your hands.
Frequently Asked Questions
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