No registration; treat it as VNC display :52.
IANA lists nothing for 5952 — it sits in the Unassigned 5915-5962 block. The only convention that reaches it is RFB display numbering, where 5900+52 is display :52. There is no well-documented malware or scanner association specific to this number; it shows up in scan data at roughly the same low rate as its neighbours.
Expose with care
Nothing standard owns this port, so identify the process before deciding anything — and if it is VNC, do not let it face the internet.
$ sudo lsof -nP -iTCP:5952 -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.
Get Beige Box →also available as JSON · Markdown
Corrections or a missing port? Reply @rimrocksystems.