Latest Facebook 504 user agents:

User Agent Platform Device
Mozilla/5.0 (iPhone; CPU iPhone OS 26_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23E254 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone12,3;FBMD/iPhone;FBSN/iOS;FBSV/26.4.1;FBSS/3;FBID/phone;FBLC/en_Qaau_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 11 Pro
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/504.0.0.62.85;FBBV/707243085;FBDV/iPhone15,4;FBMD/iPhone;FBSN/iOS;FBSV/18.5;FBSS/3;FBID/phone;FBLC/ro_RO;FBOP/5;FBRV/710721179;IABMV/1] iOS 18 iPhone 15
Mozilla/5.0 (iPhone; CPU iPhone OS 26_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23C55 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone13,2;FBMD/iPhone;FBSN/iOS;FBSV/26.2;FBSS/3;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 12
Mozilla/5.0 (iPhone; CPU iPhone OS 16_7_12 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/20H364 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone10,6;FBMD/iPhone;FBSN/iOS;FBSV/16.7.12;FBSS/3;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 16 iPhone X
Mozilla/5.0 (iPhone; CPU iPhone OS 17_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/21D61 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone12,1;FBMD/iPhone;FBSN/iOS;FBSV/17.3.1;FBSS/2;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/710721179;IABMV/1] iOS 17 iPhone 11
Mozilla/5.0 (iPhone; CPU iPhone OS 15_8_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/19H411 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone9,3;FBMD/iPhone;FBSN/iOS;FBSV/15.8.7;FBSS/2;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 15 iPhone 7
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/504.0.0.62.85;FBBV/707243085;FBDV/iPhone12,1;FBMD/iPhone;FBSN/iOS;FBSV/26.3.1;FBSS/2;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 11
Mozilla/5.0 (iPhone; CPU iPhone OS 26_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23D127 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone13,4;FBMD/iPhone;FBSN/iOS;FBSV/26.3;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 12 Pro Max
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/504.0.0.62.85;FBBV/707243085;FBDV/iPhone17,3;FBMD/iPhone;FBSN/iOS;FBSV/26.3.1;FBSS/3;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 16
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/504.0.0.62.85;FBBV/707243085;FBDV/iPhone17,3;FBMD/iPhone;FBSN/iOS;FBSV/26.3.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 16
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22H340 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone17,1;FBMD/iPhone;FBSN/iOS;FBSV/18.7.7;FBSS/3;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 18 iPhone 16 Pro
Mozilla/5.0 (iPhone; CPU iPhone OS 26_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23D127 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone13,2;FBMD/iPhone;FBSN/iOS;FBSV/26.3;FBSS/3;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 12
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/504.0.0.62.85;FBBV/707243085;FBDV/iPhone12,1;FBMD/iPhone;FBSN/iOS;FBSV/26.3.1;FBSS/2;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 11
Mozilla/5.0 (iPhone; CPU iPhone OS 17_1_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/21B101 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone13,2;FBMD/iPhone;FBSN/iOS;FBSV/17.1.2;FBSS/3;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/710721179;IABMV/1] iOS 17 iPhone 12
Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22D72 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone14,7;FBMD/iPhone;FBSN/iOS;FBSV/18.3.1;FBSS/3;FBID/phone;FBLC/en_Qaau_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 18 iPhone 14
Mozilla/5.0 (iPhone; CPU iPhone OS 16_7_15 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/20H380 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone10,4;FBMD/iPhone;FBSN/iOS;FBSV/16.7.15;FBSS/2;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 16 iPhone 8
Mozilla/5.0 (iPhone; CPU iPhone OS 18_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22B91 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone12,1;FBMD/iPhone;FBSN/iOS;FBSV/18.1.1;FBSS/2;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 18 iPhone 11
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/504.0.0.62.85;FBBV/707243085;FBDV/iPhone18,4;FBMD/iPhone;FBSN/iOS;FBSV/26.3.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone Air
Mozilla/5.0 (iPhone; CPU iPhone OS 26_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23E254 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone14,8;FBMD/iPhone;FBSN/iOS;FBSV/26.4.1;FBSS/3;FBID/phone;FBLC/en_Qaau_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 14 Plus
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22H340 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone12,1;FBMD/iPhone;FBSN/iOS;FBSV/18.7.7;FBSS/2;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 18 iPhone 11