This list is no longer actively maintained, but will be left online for reference and comments.

Updated: April 2023.

iOS devices unfortunately do not register with ActiveSync or other tools with a logical clear human readable version number. Instead, they show up with strings like "Apple-iPhone3C1/902.206"  

Obviously, this makes discovery and reporting difficult.  To help ourselves, and the community at large, we now maintain this list of hardware and iOS versions for Apple gear.

Hardware Versions:

iPod2C1 = iPod Touch 2
iPod3C1 = iPod Touch 3
iPod4C1 = iPod Touch 4
iPod5C1 = iPod Touch 5

iPad1C1 = iPad 
iPad2C1 = iPad 2 WIFI 
iPad2C2 = iPad 2 WIFI + 3G 
iPad2C3 = iPad 2 WIFI + 3G CDMA 
iPad2C4 = iPad Mini - WIFI 
iPad2C5 = iPad Mini - WIFI + LTE
iPad3C1 = The New iPad (iPad 3)- WIFI
iPad3C2 = The New iPad (iPad 3) - WIFI + LTE 
iPad3C3 = iPad with Retina Display (iPad 4) - WIFI 
iPad3C4 = iPad with Retina Display (iPad 4) - WIFI + LTE  
iPad4C1 = iPad Air - WIFI 
iPad4C2 = iPad Air - WIFI + LTE 
iPad4C4 = iPad Mini with Retina Display - WIFI
iPad4C5 = iPad Mini with Retina Display - WIFI + LTE
iPad4C7 = iPad Mini 3 WIFI
iPad4C8 = iPad Mini 3 WIFI+LTE
iPad5C1 = iPad Mini 4 - WIFI
iPad5C2 = iPad Mini 4 - WIFI + LTE
iPad5C3 - iPad Air 2 - WIFI
iPad5C4 = iPad Air 2 = WIFI + LTE
iPad6C3 = iPad Pro (9.7") - WIFI
iPad6C4 = iPad Pro (9.7") - WIFI + LTE
iPad6C7 = iPad Pro (12.9") - WIFI
iPad6C8 = iPad Pro (12.9") - WIFI + LTE
iPad6C11 = iPad 5th Gen
iPad6C12 = iPad (9.7") 2017 - WIFI
iPad7C1 = iPad Pro (12.9") WIFI 2nd Gen
iPad7C2 = iPad Pro (12.9") WIFI + LTE 2nd Gen
iPad7C3 = iPad Pro (10.5") WIFI 2nd Gen
iPad7C4 = iPad Pro (10.5") WIFI + LTE 2nd Gen
iPad7C5 = iPad 6th Gen
iPad7C6 = iPad 6th Gen
iPad7C11 = iPad (10.2") 7th Gen WIFI
iPad7C12 = iPad (10.2") 7th Gen WIFI+LTE
iPad8C1 = iPad Pro (11")
iPad8C2 = iPad Pro (11")
iPad8C3 = iPad Pro (11")
iPad8C4 = iPad Pro (11")
iPad8C5 = iPad Pro (12.9") 3rd gen
iPad8C6 = iPad Pro (12.9") 3rd gen
iPad8C7 = iPad Pro (12.9") 3rd gen
iPad8C8 = iPad Pro (12.9") 3rd gen
iPad8C11 = iPad Pro - Wi-Fi 12.9", 4th gen
iPad8C12 = iPad Pro - Wi-Fi + Cellular 12.9", 4th Gen
iPad11C1 = iPad Mini 5
iPad11C2 = iPad Mini 5
iPad11C3 = iPad Air 3rd gen
iPad11C4 = iPad Air 3rd gen
iPad11C7 = iPad - WIFI+LTE 10.2", 8th Gen

iPhone1C2 = iPhone 3G 
iPhone2C1 = iPhone 3GS
iPhone3C1 = iPhone 4 GSM
iPhone3C2 = iPhone4 GSM
iPhone3C3 = iPhone 4 CDMA
iPhone4C1 = iPhone 4S
iPhone5C1 = iPhone 5 GSM/LTE
iPhone5C2 = iPhone 5 CDMA USA/China 
iPhone5C3 = iPhone 5C GSM/CDMA/Americas
iPhone5C4 = iPhone 5C Europe/Asia
iPhone6C1 = iPhone 5S GSM/CDMA/Americas
iPhone6C2 = iPhone 5S Europe/Asia
iPhone7C1 = iPhone 6 Plus
iPhone7C2 = iPhone 6
iPhone8C1 = iPhone 6S
iPhone8C2 = iPhone 6S Plus
iPhone8C4 = iPhone SE
iPhone9C1 = iPhone 7
iPhone9C2 = iPhone 7 Plus
iPhone9C3 = iPhone 7
iPhone9C4 = iPhone 7 Plus  
iPhone10C1 = iPhone 8
iPhone10C2 = iPhone 8 Plus 
iPhone10C3 = iPhone X 
iPhone10C4 = iPhone 8 
iPhone10C5 = iPhone 8 Plus 
iPhone10C6 = iPhone X
iPhone11C2 = iPhone XS
iPhone11C6 = iPhone XS Max
iphone11C8 = iPhone XR
iphone12C1 = iPhone 11
iphone12C3 = iPhone 11 Pro
iPhone12C5 = iPhone 11 Pro Max
iPhone12C8 = iPhone SE (Second Generation)
iPhone13C1 = iPhone 12 Mini
iPhone13C2 = iPhone 12 
iPhone13C3 = iPhone 12 Pro
iPhone13C5 = iPhone 12 Pro Max
iPhone14C2 = iPhone 13 Pro
iPhone14C3 = iPhone 13 Pro Max
iPhone14C4 = iPhone 13 Mini
iPhone14C5 = iPhone 13
iPhone14C6 = iPhone SE (Third Generation)
iPhone14C7 : iPhone 14
iPhone14C8 : iPhone 14 Plus
iPhone15C2 : iPhone 14 Pro
iPhone15C3 : iPhone 14 Pro Max

iPhone OS Versions:

508.11 = 2.2.1
701.341 = 3.0
701.400 = 3.0.1 
703.144 = 3.1 
704.11 = 3.1.2 
705.18 = 3.1.3  
702.367 = 3.2 (original iPad only) 
702.405 = 3.2.1 (original iPad only) 
702.500 = 3.2.2 (original iPad only) 

From this point forward, iPhone OS was renamed iOS.

iOS Versions:

801.293 = 4.0
801.306 = 4.0.1
801.400 = 4.0.2
802.117 = 4.1
802.118 = 4.1 
803.148 = 4.2.1 
803.14800001 = 4.2.1 
805.128 = 4.2.5 
805.200 = 4.2.6 
805.303 = 4.2.7 
805.401 = 4.2.8 
805.501 = 4.2.9 
805.600 = 4.2.10 
806.190 = 4.3 
806.191 = 4.3 
807.4 = 4.3.1 
808.7 = 4.3.2 
808.8 = 4.3.2 
810.2 = 4.3.3 
810.3 = 4.3.3 
811.2 = 4.3.4 
812.1 = 4.3.5
901.334 = 5.0 
901.40x = 5.0.1 
902.17x = 5.1 
902.206 = 5.1.1 
1001.40x = 6.0 
1001.52x = 6.0.1
1002.14x= 6.1 
1002.146 = 6.1.2 
1002.329 = 6.1.3 
1002.350 = 6.1.3  
1101.465 = 7.0 
1101.470=7.0.1 
1101.47000001=7.0.1 
1101.501=7.0.2 
1102.511 = 7.0.3 
1102.55400001 = 7.0.4 
1102.601 = 7.0.5 
1102.651 = 7.0.6 
1104.167 = 7.1 
1104.169 = 7.1 
1104.201 = 7.1.1 
1104.257 = 7.1.2 
1201.365 = 8.0 
1201.366 = 8.0.1 
1201.405 = 8.0.2 
1202.410/411 = 8.1 
1202.435/436 = 8.1.1 
1202.440/445 = 8.1.2 
1202.466 = 8.1.3 
1204.508 = 8.2 
1206.69 = 8.3 
1208.143 = 8.4 
1208.321 = 8.4.1  
1301.4xxxxxx = 9.0 betas 
1301.342 = 9.0 (older devices) 
1301.344 = 9.0 
1301.402 = 9.0.1 (older devices) 
1301.404 = 9.0.1 
1301.452 = 9.0.2 
1302.143 = 9.1 
1303.075 = 9.2 
1304.15= 9.2.1 
1305.5234xxxx = 9.3 betas 
1305.234 = 9.3 
1305.328 = 9.3.1 
1306.69 = 9.3.2 
1306.72 = 9.3.2 (iPad Pro only) 
1307.34 = 9.3.3 
1307.35 = 9.3.4 
1307.36 = 9.3.5 (important security fix)
1305.5xxx = 10.0 betas 
1401.403 = 10.0.1 
1401.456 = 10.0.2 
1402.72 = 10.1 
1402.100 = 10.1.1 
1403.92 = 10.2 
1404.27 = 10.2.1 
1405.277 = 10.3 
1405.304 = 10.3.1 
1406.89 = 10.3.2 
1406.8089 = 10.3.2 (iPad Pro) 
1407.60 = 10.3.3  
1501.5xxx = 11.0 betas 
1501.372 = 11.0 
1501.402 = 11.0.1 
1501.421 = 11.0.2  
1501.432 = 11.0.3 
1502.5xx = 11.1 betas
1502.93 = 11.1 
1502.150 = 11.1.1 
1502.202 = 11.1.2 
1503.5xx = 11.2 betas 
1503.114 = 11.2 
1503.153 = 11.2.1 
1503.202 = 11.2.2 
1504.60 = 11.2.5 
1504.100 = 11.2.6 
1505.216 = 11.3 
1505.302 = 11.3.1  
1506.79 = 11.4 
1507.77 = 11.4.1

1601.5xx = 12.0 betas
1601.366 = 12.0 
1601.405 = 12.0.1
1602.5xx = 12.1 betas
1602.92 = 12.1
1603.50 = 12.1.1
1604.39 = 12.1.3 
1604.57 = 12.1.4
1605.5xx = 12.2 betas
1605.227 = 12.2 
1606.5xx = 12.3 betas
1606.156 = 12.3
1606.203 = 12.3.1
1607.5xx = 12.4 betas
1607.77 = 12.4
1607.102 = 12.4.1
1607.114 = 12.4.2
1607.130 = 12.4.3
1607.140 = 12.4.4
1607.161 = 12.4.5
1607.183 = 12.4.6
1607.192 = 12.4.7
1607.201 = 12.4.8
1608.5   = 12.4.9
1608.20 = 12.5.0

1701.5xx = 13.0 betas
1701.577 = 13.0 
1701.58x = 13.1 betas
1701.844 = 13.1
1701.854 = 13.1.2 (latest devices)
1701.86x = 13.1.2
1702.5xx = 13.2 betas
1702.84 = 13.2 
1702.102 = 13.2.2 
1702.111 = 13.2.3 
1703.5xx = 13.3 betas
1703.54 = 13.3
1704.5xx = 13.3.1 beta
1705.255 = 13.4 
1705.262 = 13.4.1
1706.75 = 13.5
1706.80 = 13.5.1 
1707.68 = 13.6
1707.80 = 13.6.1
1708.35 = 13.7

1801.5xx = 14.0 betas
1801.373 = 14.0 
1801.393 = 14.0.1
1801.8395 = 14.1
1802.5xxx = 14.2 betas
1802.92 = 14.2
1803.66 = 14.3
1804.52 = 14.4
1804.61 = 14.4.4
1804.70 = 14.4.2
1805.199 = 14.5
1805.212 = 14.5.1
1806.72 = 14.6 
1807.69 - 14.7 
1807.82 = 14.7.1
1808.17 = 14.8

190x.5xx = 15.x betas
1901.346 = 15.0
1901.348 = 15.0.1
1902.74 = 15.1 
1902.81 = 15.1.1 
1903.63 = 15.2.1 
1904.50 = 15.3
1904.52 = 15.3.1
1905.241 = 15.4
1905.258 = 15.4.1
1906.77 = 15.5
1907.71 = 15.6
1907.82 = 15.6.1
1908.12 = 15.7
1908.117 = 15.7.1

2001.362 = 16.0
2001.380 = 16.0.2
2001.392 = 16.1 (depends on model of device)
2002.82 = 16.1 (depends on model of device)
2002.101 = 16.1.1
2002.110 = 16.1.2
2003.65 = 16.2
2004.47 = 16.3
2004.67 = 16.3.1
2005.247 = 16.4
2005.252 = 16.4.1 (current)

We've also had requests for some Android agents - particularly Samsung - which are proving equally as annoying to decipher.

Samsung encodes the Android OS version number at the end of their string, with zero padding.

SAMSUNG-SGH-I337M/101.403 indicates Android 4.3 
SAMSUNG-SGH-I317M/100.40102 indicates Android 4.1.2 etc.