X11 display :59, near the top of IANA's 6000-6063 x11 block.
This is display :59 under the x11 range registration, four short of where the range ends at 6063. Nothing else is registered here, and there is no well-known product that claims it. In practice a listener means a busy X11 host — a terminal server, or a pool of Xvfb/VNC displays — with TCP transport enabled rather than the usual Unix-socket-only configuration.
Do not expose
Same as any X display over TCP: full read and write access to a live session for whoever gets past (or around) the xauth cookie.
$ sudo lsof -nP -iTCP:6059 -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.