National Instruments' port mapper — ask it for a service by name and it returns the port.
The NI Service Locator (nisvcloc) is installed with LabVIEW and other National Instruments software and listens on TCP 3580. It is a port mapper: NI services register themselves by name, and clients such as the NI Example Finder, LabVIEW Help, and the RT proxy query it to learn which dynamic port a named service is on. It accepts local and remote connections, and NI documents the port as fixed — you cannot move it. Expect it on engineering workstations, test racks, and CompactRIO controllers.
Do not expose
A port mapper enumerates the other services on the host for anyone who asks, and it fronts lab and control hardware — keep it on the test network behind a firewall.
$ nc -vz -w 3 TARGET 3580Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.