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moby--moby/docs/reference/commandline/port.md
Misty Stanley-Jones 52df69f00d Standardized formatting of CLI reference commands
Command name should be a H1

Only Description, Examples, and Related Commands should be H2

Changed 'Related information' heading to 'Related commands' since 99% it is only linking commands

Added some examples where relevant

Signed-off-by: Misty Stanley-Jones <misty@docker.com>
2017-02-08 16:57:58 -08:00

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Markdown

---
title: "port"
description: "The port command description and usage"
keywords: "port, mapping, container"
---
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# port
```markdown
Usage: docker port CONTAINER [PRIVATE_PORT[/PROTO]]
List port mappings or a specific mapping for the container
Options:
--help Print usage
```
## Examples
### Show all mapped ports
You can find out all the ports mapped by not specifying a `PRIVATE_PORT`, or
just a specific mapping:
```bash
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b650456536c7 busybox:latest top 54 minutes ago Up 54 minutes 0.0.0.0:1234->9876/tcp, 0.0.0.0:4321->7890/tcp test
$ docker port test
7890/tcp -> 0.0.0.0:4321
9876/tcp -> 0.0.0.0:1234
$ docker port test 7890/tcp
0.0.0.0:4321
$ docker port test 7890/udp
2014/06/24 11:53:36 Error: No public port '7890/udp' published for test
$ docker port test 7890
0.0.0.0:4321
```