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moby--moby/docs/reference/commandline/port.md

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<!--[metadata]>
+++
title = "port"
description = "The port command description and usage"
keywords = ["port, mapping, container"]
[menu.main]
parent = "smn_cli"
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<![end-metadata]-->
# port
Usage: docker port [OPTIONS] CONTAINER [PRIVATE_PORT[/PROTO]]
List port mappings for the CONTAINER, or lookup the public-facing port that is
NAT-ed to the PRIVATE_PORT
--help Print usage
You can find out all the ports mapped by not specifying a `PRIVATE_PORT`, or
just a specific mapping:
$ 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