The last port of the 3367-3371 satellite-video block, and the one that sits directly below MSDTC's TIP port.
IANA's satvid-datalnk range ends at 3371; the next port up, 3372, is Microsoft's TIP transaction port. Like the rest of the range, 3371 has a registrant name and nothing else — no specification, no reference implementation, no meaningful scan presence. Its practical value is as a landmark when you are reading a port list next to 3372 on a Windows host.
Expose with care
No known protocol to reason about, so nothing here justifies internet exposure without first identifying the listener.
$ nc -vz -w 3 TARGET 3371Seen 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.