Lockdown Mode can be accessed on iOS 16 or later, iPadOS 16 or later, watchOS 10 or later, and macOS Ventura or later. Further enhancements are present in iOS 17, iPadOS 17, watchOS 10, and macOS Sonoma. To ensure you have the complete range of protections, it's recommended to update your devices to the most recent software version before enabling Lockdown Mode.