The namespaces marked with x-{id} represents network namespace managed by the overlay network driver for its operation (such as creating a bridge, terminating vxlan tunnel, etc…). They don’t represent the container network namespace. Since it is managed by the driver, it is not recommended to manipulate anything within this namespace. But if you are curious on the deep dive, then you can use the “nsenter” tool to understand more about this internal namespace.
Example : nsenter -net=/var/run/docker/netns/2-e6bd07dcef ifconfig