# WHATPORT(4111)

## NAME

port 4111 — Xgrid — Apple's discontinued Xgrid distributed-computing service — a live one means a very old Mac.

Protocol: TCP  
IANA registry

## DESCRIPTION

Xgrid was Apple's cluster-computing framework in Mac OS X and Mac OS X Server: an Xgrid controller accepted job submissions from clients and farmed tasks out to agent machines, and IANA still carries the port under the name xgrid. Apple removed Xgrid in OS X Mountain Lion, so nothing current ships it. Finding 4111 open today points at a Mac left on 10.7 or earlier with Xgrid still enabled.

## EXPOSURE

**Do not expose.** It accepts job submissions — remote execution — from an unmaintained, end-of-life service stack; there is no configuration that makes this safe to publish.

## CHECK

```sh
nc -vz -w 3 TARGET 4111
```

## SEE ALSO

- iana — [IANA port registry — 4111 (xgrid)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=4111) (iana.org)

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HTML: <https://whatport.net/4111/> · JSON: <https://whatport.net/4111.json> · full dataset: <https://whatport.net/ports.json>