Latest Chrome Mobile 51 user agents:

User Agent Platform Device
Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.4485.1315 Mobile Safari/537.36 iOS 11 iPhone
Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.7535.1479 Mobile Safari/537.36 iOS 11 iPhone
Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.6143.1744 Mobile Safari/537.36 Android 6 Nexus 5
Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.1711.1469 Mobile Safari/537.36 Android 6 Nexus 5
Mozilla/5.0 (Linux; Android 8.0; Pixel 2 Build/OPD3.170816.012) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2211.1781 Mobile Safari/537.36 Android 8 Pixel 2
Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.1932.1602 Mobile Safari/537.36 iOS 11 iPhone
Mozilla/5.0 (Linux; Android 5.0; SM-G900P Build/LRX21T) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.7442.1738 Mobile Safari/537.36 Android 5 Galaxy S5
Mozilla/5.0 (Linux; Android 8.0; Pixel 2 Build/OPD3.170816.012) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.1049.1759 Mobile Safari/537.36 Android 8 Pixel 2
Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.7885.1777 Mobile Safari/537.36 Android 6 Nexus 5
Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.6520.1010 Mobile Safari/537.36 iOS 11 iPhone
Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.9337.1147 Mobile Safari/537.36 Android 6 Nexus 5
Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.1533.1011 Mobile Safari/537.36 Android 6 Nexus 5
Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2398.1553 Mobile Safari/537.36 Android 6 Nexus 5
Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.6138.1379 Mobile Safari/537.36 iOS 11 iPhone
Mozilla/5.0 (Linux; Android 8.0; Pixel 2 Build/OPD3.170816.012) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.3455.1131 Mobile Safari/537.36 Android 8 Pixel 2
Mozilla/5.0 (Linux; Android 4.4.2; V.45S Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.81 Mobile Safari/537.36 Android 4 Unknown
Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.9714.1407 Mobile Safari/537.36 Android 6 Nexus 5
Mozilla/5.0 (Linux; Android 5.0; SM-G900P Build/LRX21T) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.9533.1787 Mobile Safari/537.36 Android 5 Galaxy S5
Mozilla/5.0 (Linux; Android 8.0; Pixel 2 Build/OPD3.170816.012) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2389.1265 Mobile Safari/537.36 Android 8 Pixel 2
Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2696.1841 Mobile Safari/537.36 iOS 11 iPhone