What Port 2434 Is
Port 2434 is in the registered ports range (1024–49151). These ports are assigned by IANA to specific services and applications — in contrast to the well-known ports below 1024, which are reserved for foundational Internet infrastructure.
IANA lists port 2434 as assigned to pxc-epmap, registered by Jun Nakamura, for both TCP and UDP. That's the full extent of the official record. No RFC. No specification document. No link to software or a vendor.1
What pxc-epmap Probably Means
The name is suggestive. EPMAP (Endpoint Mapper) is the function of port 135 — Microsoft's mechanism for clients to discover which dynamic port a particular RPC service is listening on. It maps service identifiers to network endpoints.
PXC appears in Siemens' product line: the Desigo PXC series of building automation controllers, used to manage HVAC, lighting, and environmental systems in commercial buildings. The combination suggests pxc-epmap may have been intended as an endpoint discovery service for PXC controllers — a way for building management software to locate which addresses and ports individual PXC devices were listening on.
This is inference, not documentation. No Siemens technical manual publicly mentions port 2434, and no security research has identified active pxc-epmap traffic in the wild.
What You'll Actually Find Here
Almost certainly nothing, or something unrelated. Because pxc-epmap has no documented implementation, port 2434 is effectively unclaimed territory in practice. If something is listening on port 2434 on your system, it's using this port by coincidence or convenience — not because the software is implementing pxc-epmap.
How to Check What's Listening on Port 2434
On Linux/macOS:
On Windows:
The PID from netstat can be matched against tasklist to identify the process. On macOS, lsof will show the process name directly.
Why This Port Still Matters
Unassigned or dormant registered ports are worth understanding for a few reasons:
Security scanners flag them. If something is listening on a registered port with no known legitimate service, it's a signal worth investigating — malware sometimes chooses obscure registered ports precisely because they're unlikely to be monitored.
Firewall rules reference them. A rule blocking "all unrecognized registered ports" may hit port 2434. Knowing why it's in that category helps you make informed decisions.
The IANA registry is imperfect. Not every registered port corresponds to a living protocol. Some assignments were filed decades ago for software that never shipped or no longer exists. Port 2434 may be one of those.
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