What Range This Port Belongs To
Port 2058 sits in the registered ports range (1024-49151). These are ports that companies and developers formally claimed with IANA — the Internet Assigned Numbers Authority — to reserve for their specific services.
The registered range is the middle territory of the port space. Below it, the well-known ports (0-1023) hold the Internet's foundational protocols: HTTP, SSH, DNS, SMTP. Above it, the ephemeral ports (49152-65535) are handed out dynamically to outbound connections and then released. Registered ports are the permanent addresses — claimed, named, and recorded.
The Official Assignment
IANA records port 2058 as belonging to NewWaveSearchables RMI, registered by a contact named Thomas Kerkau. The protocol: Remote Method Invocation, a Java mechanism for calling methods on objects running on remote machines.
That's everything the official record says. No RFC. No documentation. No trace of NewWave Searchables as a company. The registration exists; the registrant does not appear to.1
This is not unusual. The registered port space was claimed incrementally over decades, and many early registrations belong to products, companies, and projects that never shipped or quietly disappeared. IANA doesn't reclaim ports. The entry stands.
What You'll Find Here in Practice
Almost nothing runs on port 2058 intentionally today. If you see traffic on this port:
- It's almost certainly not NewWaveSearchables RMI
- It may be custom software using an uncontested port number
- It may be a misconfigured service
- In rarer cases, malware occasionally uses obscure registered ports to blend in with "legitimate" traffic
How to Check What's Listening on Port 2058
macOS and Linux:
Windows:
Then match the PID to a process in Task Manager or with:
Linux (alternative):
If something is listening here on your machine and you didn't put it there, find out what it is.
Why Unassigned-in-Practice Ports Matter
The port registry is not a perfect map of what actually runs on the Internet. It's a historical record of claims, many made decades ago by organizations that no longer exist. Port 2058 is registered but functionally unclaimed — which makes it both harmless in most contexts and worth a second look if it ever shows up unexpectedly in your network traffic.
The gap between "registered" and "actually in use" is one of the quiet realities of the port system. There are 48,128 ports in the registered range. Not all of them are filled with active, living services. Some are memorials.
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