X11 display :7 by registration; in practice the port a second TensorBoard lands on.
By IANA's 6000-6063 x11 block this is display :7. The common real-world sighting is a second TensorBoard instance: 6006 is the default, so a second instance is commonly started with --port 6007. Either way you are looking at a machine running graphical or ML workloads, not a general-purpose service. Confirm which by what answers — an X server speaks the X protocol, TensorBoard answers HTTP.
Do not expose
Both plausible occupants are unauthenticated: an X server here can be driven by anyone who reaches it, and a TensorBoard here exposes training data to anyone who asks.
$ curl -sI http://TARGET:6007/Seen 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.