Registered to BIOTIC, a binary IoT messaging protocol — rarely seen on real networks.
IANA assigns 5087/tcp to biotic, "Binary Internet of Things Interoperable Communication", a protocol proposal from Peter Waher aimed at resource-constrained IoT devices that combines request/response, publish/subscribe, and peer-to-peer patterns in one binary encoding. The UDP side of 5087 is Reserved. Deployment is minimal, so a listener on this port is much more likely to be an unrelated application than a BIOTIC endpoint.
Expose with care
Identify the actual service before opening it; the registration alone says nothing about whether what is listening authenticates or encrypts.
$ sudo lsof -nP -iTCP:5087 -sTCP:LISTENSeen 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.