Web Reference: Dec 30, 2013 · When you specify just one number (e.g. 80, not 80:80), docker maps the specified container port to a host port from the ephemeral range. By default, for both IPv4 and IPv6, the Docker daemon blocks access to ports that have not been published. Published container ports are mapped to host IP addresses. To do this, it uses firewall rules to perform Network Address Translation (NAT), Port Address Translation (PAT), and masquerading. Jan 16, 2026 · Learn how to correctly map ports in Docker using host, bridge, and container network modes, including port publishing, range mapping, and troubleshooting common networking issues.
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