What Range This Port Belongs To
Port 2958 sits in the registered ports range (1024–49151). These ports are tracked by IANA — the Internet Assigned Numbers Authority — which maintains the official list of what service is supposed to run where.
Unlike the well-known ports (0–1023), registered ports don't require root or administrator privileges to open. Anyone can run a service on port 2958. The registration just means someone, at some point, asked IANA to associate a name with this number.
The Official Registration: jmact6
IANA lists port 2958 as assigned to jmact6, sometimes written JAMCT6.
The name suggests it's the sixth in a series — JAMCT1 through JAMCT6 — occupying ports in the 2953–2958 range. What JAM stands for, what these ports do, and who registered them: no public documentation explains it. The RFC database has nothing. Vendor documentation is absent. The registration exists; the protocol it names has left no trace.1
This isn't unusual. IANA's list contains hundreds of entries like this — names registered during the dial-up era for products that never shipped, companies that folded, or protocols that were documented internally but never publicly. Port 2958 appears to be one of them.
What's Actually Listening Here
In practice, port 2958 is open territory. No major application uses it by convention. If you see this port active on a machine, something specific to that system opened it — whether a legitimate internal tool, a custom service, or something worth investigating.
Security scanners have historically flagged the port range around 2958 as occasionally appearing in malware traffic, though there's no specific, well-documented threat tied to this port number.2
How to Check What's Using Port 2958
On Linux or macOS:
On Windows:
The process ID in the output tells you exactly what's listening. Cross-reference it with Task Manager or ps aux to identify the application.
Why Unassigned-in-Practice Ports Matter
The registered ports range was designed to bring order to port allocation — a directory so devices know where to find services. But registrations don't expire, and documentation was never required. The result is thousands of port numbers that are technically claimed but practically unclaimed, sitting between the busy well-known ports and the ephemeral range above 49151.
Port 2958 is one of the quieter corners of the Internet's address space: officially named, functionally silent.
Frequently Asked Questions
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