DockerCLI/docs/reference/commandline/network_ls.md

docker network ls

Usage:  docker network ls [OPTIONS]

Lists all the networks created by the user
  --help=false          Print usage
  --no-trunc=false      Do not truncate the output
  -q, --quiet=false     Only display numeric IDs

Lists all the networks Docker knows about. This include the networks that spans across multiple hosts in a cluster.

Example output:

    $ sudo docker network ls
    NETWORK ID          NAME                DRIVER
    7fca4eb8c647        bridge              bridge
    9f904ee27bf5        none                null
    cf03ee007fb4        host                host