Registered as "MCER Port"; no public documentation and effectively never seen.
IANA registers 6510 TCP and UDP as mcer-port, "MCER Port", assigned to Portnoy Boxman, and Unix /etc/services repeats the entry. No protocol specification, product page, or implementation is publicly available, so the registration is the entire documented record. Scanners naming 6510 "mcer-port" are quoting the registry rather than recognising a service.
Expose with care
Nothing is known about what would answer here, so no verdict is defensible without identifying the local process first.
$ sudo lsof -nP -iTCP:6510 -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.