Fly.io introduces 6PN, a feature that enables private networking within an organization's applications deployed on the platform. This feature aims to simplify and enhance security by allowing services to communicate with each other without public IP addresses or manual certificate management. With 6PN, every instance of every application in an organization has an additional IPv6 address for internal communication. The DNS is used to resolve these addresses within the organization's network. This feature will soon be enabled by default and requires no additional configuration.