https://everymac.com/systems/apple/ipad/index-ipad-specs.html32bit
iPad Wi-Fi (Original/1st Gen)16, 32, 64 gb
iPad Wi-Fi/3G/GPS (Original/1st Gen)16, 32, 64 gb
iPad 2 (Wi-Fi Only)16, 32, 64 gb
iPad 2 (Wi-Fi/GSM/GPS)16, 32, 64 gb
iPad 2 (Wi-Fi/CDMA/GPS)16, 32, 64 gb
iPad 2 (Wi-Fi Only, iPad2,4)16 gb
https://en.wikipedia.org/wiki/IPad_(3rd_generation)
CPU: A5X (March 2012)
iPad 3rd Gen (Wi-Fi Only)16, 32, 64 gb
iPad 3rd Gen (Wi-Fi/Cellular AT&T/GPS)16, 32, 64 gb
iPad 3rd Gen (Wi-Fi/Cellular Verizon/GPS)16, 32, 64 gb
https://en.wikipedia.org/wiki/IPad_Mini
CPU: A5 (Oct 2012)
*iPad mini (Wi-Fi Only/1st Gen)16, 32, 64 gb
iPad mini (Wi-Fi/AT&T/GPS - 1st Gen)16, 32, 64 gb
iPad mini (Wi-Fi/VZ & Sprint/GPS - 1st Gen)16, 32, 64 gb
https://en.wikipedia.org/wiki/IPad_(4th_generation)
CPU: A6X (Oct 2012)
iPad 4th Gen (Wi-Fi Only)16, 32, 64, 128 gb
*iPad 4th Gen (Wi-Fi/AT&T/GPS)16, 32, 64, 128 gb
*iPad 4th Gen (Wi-Fi/Verizon & Sprint/GPS)16, 32, 64, 128 gb
the ipad 4 was the first ipad to move from the 30 pin connector to the smaller lightning connector
64bithttps://en.wikipedia.org/wiki/IPad_AirCPU: A7 (Oct 2013)
iPad Air (Wi-Fi Only)16, 32, 64, 128 gb
iPad Air (Wi-Fi/Cellular)16, 32, 64, 128 gb
https://en.wikipedia.org/wiki/IPad_Mini_2CPU: A7 (Oct 2013) -----
iPad mini 2 (Retina/2nd Gen, Wi-Fi Only)16, 32, 64, 128 gb
iPad mini 2 (Retina/2nd Gen, Wi-Fi/Cellular)16, 32, 64, 128 gb
https://en.wikipedia.org/wiki/IPad_Mini_3CPU: A7 (Oct 2014) -----
*iPad mini 3 (Wi-Fi Only)16, 64, 128 gb
iPad mini 3 (Wi-Fi/Cellular)16, 64, 128 gb
obsolete divider line
https://en.wikipedia.org/wiki/IPad_Air_2CPU: A8X (Oct 2014)
*wifiAC iPad Air 2 (Wi-Fi Only)16, 32, 64, 128 gb
*iPad Air 2 (Wi-Fi/Cellular)16, 32, 64, 128 gb
https://en.wikipedia.org/wiki/IPad_Mini_4CPU: A8 (Sep 2015)
*wifiAC iPad mini 4 (Wi-Fi Only)16, 32, 64, 128 gb
*iPad mini 4 (Wi-Fi/Cellular)16, 32, 64, 128 gb
CPU: A9X (Mar 2016)
*iPad Pro 12.9" (Wi-Fi Only)32, 128, 256 gb
iPad Pro 12.9" (Wi-Fi/Cellular)128, 256 gb
iPad Pro 9.7" (Wi-Fi Only)32, 128, 256 gb
iPad Pro 9.7" (Wi-Fi/Cellular)32, 128, 256 gb
CPU: A9 (2017)
iPad 9.7" 5th Gen (Wi-Fi Only)32, 128 gb
iPad 9.7" 5th Gen (Wi-Fi/Cellular)32, 128 gb
CPU: A10X (June 2017)
iPad Pro 10.5" (Wi-Fi Only)64, 256, 512 gb
iPad Pro 10.5" (Wi-Fi/Cellular)64, 256, 512 gb
iPad Pro 12.9" (Wi-Fi Only - 2nd Gen)64, 256, 512 gb
iPad Pro 12.9" (Wi-Fi/Cell - 2nd Gen)64, 256, 512 gb
CPU: A10 (2018)
iPad 9.7" 6th Gen (Wi-Fi Only)32, 128 gb
iPad 9.7" 6th Gen (Wi-Fi/Cellular)32, 128 gb
CPU: A12X
iPad Pro 11" (Wi-Fi Only) 64, 256, 512 gb; 1 TB
iPad Pro 11" (Wi-Fi/Celluar - US/CA)64, 256, 512 gb; 1 TB
iPad Pro 11" (Wi-Fi/Celluar - Global)64, 256, 512 gb ; 1 TB
iPad Pro 12.9" (Wi-Fi Only - 3rd Gen)64, 256, 512 gb; 1 TB
iPad Pro 12.9" (Wi-Fi+Cell US/CA - 3rd Gen)64, 256, 512 gb; 1 TB
iPad Pro 12.9" (Wi-Fi+Cell Global - 3rd Gen)64, 256, 512 gb; 1 TB
CPU: A12 (2019)
iPad Air 3rd Gen (Wi-Fi Only)64, 256 gb
iPad Air 3rd Gen (Wi-Fi+Cell US/CA)64, 256 gb
iPad Air 3rd Gen (Wi-Fi+Cell Global)64, 256 gb
iPad mini 5th Gen (Wi-Fi Only)64, 256 gb
iPad mini 5th Gen (Wi-Fi+Cell US/CA)64, 256 gb
iPad mini 5th Gen (Wi-Fi+Cell Global)64, 256 gb
