Latest Facebook 421 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; ZTE Blade A7s Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.196 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 Blade A7s
Mozilla/5.0 (Linux; Android 9; ZTE Blade 10 Vita Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.202 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.30.47;] Android 9 Blade 10 Vita
Mozilla/5.0 (Linux; Android 9; ZTE A2019G Pro Build/PKQ1.181203.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.202 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 Axon 9 Pro
Mozilla/5.0 (Linux; Android 9; Z6201V Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.202 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 Blade A7
Mozilla/5.0 (Linux; Android 9; Z6201V Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.196 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 Blade A7
Mozilla/5.0 (Linux; Android 9; Y4800 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.202 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 Y4800
Mozilla/5.0 (Linux; Android 9; X2_euro Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.202 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 X2
Mozilla/5.0 (Linux; Android 9; X2_euro Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.196 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 X2
Mozilla/5.0 (Linux; Android 9; X19 S Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.202 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 X19 S
Mozilla/5.0 (Linux; Android 9; W-P611-OPE Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.202 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 View 3 Pro
Mozilla/5.0 (Linux; Android 9; W-P611-EEA Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.202 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 View 3 Pro
Mozilla/5.0 (Linux; Android 9; W-P611-EEA Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.196 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 View 3 Pro
Mozilla/5.0 (Linux; Android 9; vivo Z1i Build/PKQ1.180819.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/117.0.0.0 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 Z1i
Mozilla/5.0 (Linux; Android 9; vivo X21i A Build/P00610; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.202 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 X21i A
Mozilla/5.0 (Linux; Android 9; VIEW 1 Build/P00610; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.196 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 View 1
Mozilla/5.0 (Linux; Android 9; VIEW 1 Build/P00610; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.147 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 View 1
Mozilla/5.0 (Linux; Android 9; V1945A Build/PKQ1.190626.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.196 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 Y9s
Mozilla/5.0 (Linux; Android 9; V1941A Build/PKQ1.190302.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.202 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 U3
Mozilla/5.0 (Linux; Android 9; V1930A Build/PKQ1.190616.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.202 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 Y3 Standard
Mozilla/5.0 (Linux; Android 9; V1930A Build/PKQ1.190616.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.196 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/421.0.0.33.47;] Android 9 Y3 Standard