# WHATPORT(625)

## NAME

port 625 — dec-dlm / Apple ODProxy — Registered to DEC's distributed lock manager, but on a Mac it is Open Directory Proxy.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA registers 625 as dec-dlm (previously spelled dec_dlm), the Digital Equipment Corporation Distributed Lock Manager from the VMS cluster era, which you will not encounter today. The number is widely reported on macOS as Open Directory Proxy — odproxyd, which relays directory lookups for a Mac bound to an Open Directory domain — but Apple publishes no documentation for the port, so treat that as a field observation and confirm it against the running process rather than the registry name.

## EXPOSURE

**Do not expose.** If this is Open Directory Proxy, it answers questions about your account namespace and belongs on a managed LAN; if it is something else, you do not know what it is until you identify the process.

## CHECK

```sh
nc -vz -w 3 TARGET 625
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry — 625](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=625) (iana.org)

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HTML: <https://whatport.net/625/> · JSON: <https://whatport.net/625.json> · full dataset: <https://whatport.net/ports.json>