# WHATPORT(6006)

## NAME

port 6006 — TensorBoard (IANA: X11 display :6) — TensorBoard's default HTTP port, squatting inside IANA's X11 range.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA registers 6000-6063 to X11, making 6006 display :6, but in practice almost everything you find here is TensorBoard: running `tensorboard --logdir ...` serves its web UI on 6006 and tells you to open http://localhost:6006. It is a plain HTTP server with no authentication and no authorization, reading whatever event files live under the log directory. It shows up on GPU boxes, notebook servers, and ML training containers, often port-forwarded rather than bound publicly.

## EXPOSURE

**Do not expose.** TensorBoard has no login of any kind — anyone who reaches the port reads your training runs, hyperparameters, and any embedded data. Bind it to localhost and reach it through an SSH tunnel.

## CHECK

```sh
curl -sI http://TARGET:6006/
```

## SEE ALSO

- source — [tensorflow/tensorboard on GitHub](https://github.com/tensorflow/tensorboard) (github.com)
- iana — [IANA Service Name and Transport Protocol Port Number Registry — 6000-6063 (x11)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=6006) (iana.org)

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