Latest Facebook 521 user agents:

User Agent Platform Device
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 [FBAN/FBIOS;FBAV/521.1.0.44.106;FBBV/780768255;FBDV/iPhone12,5;FBMD/iPhone;FBSN/iOS;FBSV/26.3.1;FBSS/3;FBCR/;FBID/phone;FBLC/de_DE;FBOP/80] iOS 18 iPhone 11 Pro Max
Mozilla/5.0 (iPhone; CPU iPhone OS 18_6_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22G100 [FBAN/FBIOS;FBAV/521.0.0.38.98;FBBV/760232234;FBDV/iPhone14,5;FBMD/iPhone;FBSN/iOS;FBSV/18.6.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/764780440;IABMV/1] iOS 18 iPhone 13
Mozilla/5.0 (iPhone; CPU iPhone OS 26_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23D8133 [FBAN/FBIOS;FBAV/521.0.0.38.98;FBBV/760232234;FBDV/iPhone14,5;FBMD/iPhone;FBSN/iOS;FBSV/26.3.1;FBSS/3;FBID/phone;FBLC/fr_FR;FBOP/5;FBRV/764780440;IABMV/1] iOS 26 iPhone 13
Mozilla/5.0 (iPhone; CPU iPhone OS 18_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22F76 [FBAN/FBIOS;FBAV/521.0.0.38.98;FBBV/760232234;FBDV/iPhone14,8;FBMD/iPhone;FBSN/iOS;FBSV/18.5;FBSS/3;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/764780440;IABMV/1] iOS 18 iPhone 14 Plus
Mozilla/5.0 (iPhone; CPU iPhone OS 26_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23D8133 [FBAN/FBIOS;FBAV/521.0.0.38.98;FBBV/760232234;FBDV/iPhone14,2;FBMD/iPhone;FBSN/iOS;FBSV/26.3.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/764780440;IABMV/1] iOS 26 iPhone 13 Pro
Mozilla/5.0 (Linux; Android 16; SM-S936U Build/BP2A.250605.031.A3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.146 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/521.0.0.42.97;IABMV/1;] Android 16 Galaxy S25+
Mozilla/5.0 (Linux; Android 16; SM-A156U Build/BP2A.250605.031.A3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.146 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/521.0.0.42.97;IABMV/1;] Android 16 Galaxy A15 5G
Mozilla/5.0 (Linux; Android 9; SM-A505F; ) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/135.0.7049.112 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/521.0.0.42.97;] Android 9 Galaxy A50
Mozilla/5.0 (iPhone; CPU iPhone OS 18_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22F76 [FBAN/FBIOS;FBAV/521.0.0.38.98;FBBV/760232234;FBDV/iPhone16,2;FBMD/iPhone;FBSN/iOS;FBSV/18.5;FBSS/3;FBID/phone;FBLC/vi_VN;FBOP/5;FBRV/764780440;IABMV/1] iOS 18 iPhone 15 Pro Max
Mozilla/5.0 (Linux; Android 9; YK_P30 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.146 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/521.0.0.42.97;IABMV/1;] FBNV/5 Android 9 YK P30
Mozilla/5.0 (Linux; Android 9; YK_P30 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.146 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/521.0.0.42.97;IABMV/1;] Android 9 YK P30
Mozilla/5.0 (Linux; Android 9; U693CL Build/U693CL_01.02.05; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.146 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/521.0.0.42.97;IABMV/1;] Android 9 UMX U693CL
Mozilla/5.0 (Linux; Android 9; Trekker-X4 Build/PKQ1.190414.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.146 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/521.0.0.42.97;IABMV/1;] Android 9 Trekker-X4
Mozilla/5.0 (Linux; Android 9; TBBVNC100005208 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.146 Safari/537.36 [FB_IAB/FB4A;FBAV/521.0.0.42.97;IABMV/1;] Android 9 TBBVNC100005208
Mozilla/5.0 (Linux; Android 9; TBBVNC100005207 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.146 Safari/537.36 [FB_IAB/FB4A;FBAV/521.0.0.42.97;IABMV/1;] FBNV/5 Android 9 TBBVNC100005207
Mozilla/5.0 (Linux; Android 9; TBBVNC100005207 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.146 Safari/537.36 [FB_IAB/FB4A;FBAV/521.0.0.42.97;IABMV/1;] Android 9 TBBVNC100005207
Mozilla/5.0 (Linux; Android 9; SM-T820 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.146 Safari/537.36 [FB_IAB/FB4A;FBAV/521.0.0.42.97;IABMV/1;] Android 9 Galaxy Tab S3 9.7" WiFi
Mozilla/5.0 (Linux; Android 9; SM-T397U Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.146 Safari/537.36 [FB_IAB/FB4A;FBAV/521.0.0.42.97;IABMV/1;] Android 9 Galaxy Tab Active 2 8.0"
Mozilla/5.0 (Linux; Android 9; Redmi 4 Prime Build/PQ3A.190801.002; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.146 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/521.0.0.42.97;IABMV/1;] Android 9 Redmi 4 Prime
Mozilla/5.0 (Linux; Android 9; RCT6613W23P Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.146 Safari/537.36 [FB_IAB/FB4A;FBAV/521.0.0.42.97;IABMV/1;] Android 9 Delta Pro 11.6"