The keyboard-and-mouse sharing port — one machine's input driving the screens of several others.
Deskflow, and the Synergy, Barrier and Input Leap family it descends from, lets one keyboard and mouse control several computers by moving the pointer off the edge of a screen. The server listens on TCP 24800 and clients connect to it; the protocol carries mouse motion, key events and clipboard contents, and version 1.4 and later can wrap the connection in TLS. The default is hard-coded across the codebase and documentation, so an open 24800 on a desktop is almost always this. It is a workstation port, not a server one.
Do not expose
This is a remote input channel into a live desktop session, including the clipboard. Keep it on the LAN or inside a VPN — never reachable from the internet.
$ nmap -Pn -sV -p 24800 --reason TARGETSeen 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.