Latest Facebook 504 user agents:

User Agent Platform Device
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/iPhone11,8;FBMD/iPhone;FBSN/iOS;FBSV/18.7.7;FBSS/2;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 18 iPhone XR
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/iPhone16,1;FBMD/iPhone;FBSN/iOS;FBSV/26.3.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 15 Pro
Mozilla/5.0 (iPhone; CPU iPhone OS 18_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22D63 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone12,8;FBMD/iPhone;FBSN/iOS;FBSV/18.3;FBSS/2;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/710721179;IABMV/1] iOS 18 iPhone SE (2020)
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/504.0.0.62.85;FBBV/707243085;FBDV/iPhone12,1;FBMD/iPhone;FBSN/iOS;FBSV/18.6.2;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_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23E261 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone17,1;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 16 Pro
Mozilla/5.0 (iPhone; CPU iPhone OS 17_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/21F90 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone16,1;FBMD/iPhone;FBSN/iOS;FBSV/17.5.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 17 iPhone 15 Pro
Mozilla/5.0 (iPhone; CPU iPhone OS 26_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23E261 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone14,3;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 13 Pro Max
Mozilla/5.0 (iPhone; CPU iPhone OS 26_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23E261 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone12,3;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 11 Pro
Mozilla/5.0 (iPhone; CPU iPhone OS 26_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23E261 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone12,1;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/2;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 11
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7_8 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22H352 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone17,1;FBMD/iPhone;FBSN/iOS;FBSV/18.7.8;FBSS/3;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/710721179;IABMV/1] iOS 18 iPhone 16 Pro
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7_9 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22H355 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone11,8;FBMD/iPhone;FBSN/iOS;FBSV/18.7.9;FBSS/2;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 18 iPhone XR
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/iPhone13,2;FBMD/iPhone;FBSN/iOS;FBSV/18.3.1;FBSS/3;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/710721179;IABMV/1] iOS 18 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/iPhone14,5;FBMD/iPhone;FBSN/iOS;FBSV/18.3.1;FBSS/3;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 18 iPhone 13
Mozilla/5.0 (iPhone; CPU iPhone OS 26_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23E261 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone13,2;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 12
Mozilla/5.0 (iPhone; CPU iPhone OS 26_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23E261 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone13,2;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/fr_FR;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 12
Mozilla/5.0 (iPhone; CPU iPhone OS 26_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23E261 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone17,5;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 16e
Mozilla/5.0 (iPad; CPU OS 26_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23E261 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPad12,1;FBMD/iPad;FBSN/iPadOS;FBSV/26.4.2;FBSS/2;FBID/tablet;FBLC/en_GB;FBOP/5;FBRV/710721179] iPadOS 26 iPad 9 10.2" WiFi
Mozilla/5.0 (iPhone; CPU iPhone OS 26_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23E261 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone14,7;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 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/iPhone10,5;FBMD/iPhone;FBSN/iOS;FBSV/16.7.15;FBSS/3;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 16 iPhone 8 Plus
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/iPhone10,5;FBMD/iPhone;FBSN/iOS;FBSV/16.7.15;FBSS/3;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 16 iPhone 8 Plus