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iPad models compatible with iPadOS 18 - Apple Support
iPad (4th generation) - Wikipedia
iPadOS 18 is now available, taking iPad to the next level
iPad (4th generation) - Technical Specifications - Apple Support
iPadOS 18 - Apple
iPadOS 16 is available today - Apple
ipad 4th Gen highest ios version upgrade - Apple Community
How long does Apple support iPads? - Macworld
iOS version by device — iOS Ref
iPadOS Compatibility Chart: Max Supported OS For Each iPad