Registered as the server half of a "resource tracking system" with no public specification.
IANA registers 2500 as rtsserv, "Resource Tracking system server", paired with rtsclient on 2501. No specification accompanies the registration and no widely deployed product defaults here, so the name identifies almost nothing in practice. Being a round number just above the well-known range, 2500 is also a popular arbitrary choice for ad-hoc services, which makes process identification the only reliable answer.
Expose with care
Whatever is here was almost certainly chosen by a person, not by a protocol; find the process and judge it on its own authentication and encryption.
$ sudo lsof -nP -iTCP:2500 -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.