DockerCLI/docs/reference/commandline/port.md

title	description	keywords
port	The port command description and usage	port, mapping, container

port

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:

$ 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