# WHATPORT(6600)

## NAME

port 6600 — MPD / Hyper-V Live Migration — Music Player Daemon's control port in practice; registered to Microsoft for Hyper-V Live Migration.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA registered 6600/tcp in 2009 as mshvlm, Microsoft Hyper-V Live Migration — the channel that carries a running VM's memory between cluster hosts. On Linux and macOS boxes, though, an open 6600 is almost always MPD, the Music Player Daemon: its documentation states that if no port is specified the default is 6600. MPD speaks a simple line-based text protocol that greets you with "OK MPD <version>" and then accepts library and playback commands, with a password being optional.

## EXPOSURE

**Do not expose.** MPD's protocol is cleartext and unauthenticated unless you configure a password, and it exposes your library paths and playback control. Hyper-V live migration traffic is cluster-internal by design. Neither belongs on a public IP.

## CHECK

```sh
printf 'status\nclose\n' | nc TARGET 6600
```

## SEE ALSO

- docs — [MPD User Manual — configuration and the default port](https://mpd.readthedocs.io/en/latest/user.html) (mpd.readthedocs.io)
- source — [Music Player Daemon source repository](https://github.com/MusicPlayerDaemon/MPD) (github.com)
- iana — [IANA Service Name and Transport Protocol Port Number Registry — 6600 (mshvlm)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=6600) (iana.org)

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