What This Port Is
Port 2113 sits in the registered port range (1024–49151). These ports are not claimed by the operating system like the well-known ports below 1024, but they are filed with IANA — the Internet Assigned Numbers Authority, the body that coordinates global port assignments.
IANA's registry lists port 2113 as assigned to a service called HSL StoRM, with the service name hsl-storm, supporting both TCP and UDP. The assignee is High Sec Labs (HSL), an Israeli company that manufactures high-security KVM switches and network isolation hardware for governments, military agencies, and financial institutions.1
The Honest Problem
Despite the registration, almost no public documentation exists about what HSL StoRM actually is or what it does on port 2113.
High Sec Labs makes real, well-regarded products — their secure KVM switches are used in classified environments where computers on different networks must share peripherals without any possibility of data crossing between them. "StoRM" likely refers to some component of their management or monitoring software stack. But the details aren't public, probably because their customers are exactly the kind of organizations that don't publish their internal architecture.
This is common in the registered port range. Getting a port registered with IANA requires filling out a form, not shipping widely-adopted software. Many registered ports belong to proprietary enterprise or government tools that the general public will never encounter.
What "Registered" Actually Means
The registered port range exists so that applications can stake a claim on a port number — preventing collisions where two different programs independently try to use the same port. But registration is not certification, and it is not documentation.
IANA records who asked for the port and what they called their service. It does not verify the software works, that it's actively deployed, or that anyone outside the registrant's organization will ever use it. Port 2113 has a name in the registry. That's all it has publicly.
If you see traffic on port 2113 in the wild, it is almost certainly not HSL StoRM — that software runs in air-gapped or highly controlled environments that don't appear in ordinary network scans. Unexpected traffic here is more likely a misconfigured application that wandered onto an unoccupied port, or something worth investigating.
How to Check What's Listening on This Port
To see if anything on your machine is using port 2113:
macOS / Linux:
Linux (alternative):
Windows:
The process ID in the output will tell you exactly what's listening. If you're seeing unexpected traffic on this port from outside your machine, a firewall rule blocking inbound connections on 2113 is appropriate — nothing that should be reaching you from the Internet lives here.
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