Latest Facebook 504 user agents:

User Agent Platform Device
Mozilla/5.0 (iPhone; CPU iPhone OS 26_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23F81 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone18,2;FBMD/iPhone;FBSN/iOS;FBSV/26.5.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 17 Pro Max
Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22D82 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone11,8;FBMD/iPhone;FBSN/iOS;FBSV/18.3.2;FBSS/2;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 18 iPhone XR
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/iPad13,18;FBMD/iPad;FBSN/iPadOS;FBSV/26.4.2;FBSS/2;FBID/tablet;FBLC/en_US;FBOP/5;FBRV/710721179] iPadOS 26 iPad 10 10.9" WiFi
Mozilla/5.0 (iPhone; CPU iPhone OS 26_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23F77 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone14,6;FBMD/iPhone;FBSN/iOS;FBSV/26.5;FBSS/2;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone SE (2022)
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/iPhone11,8;FBMD/iPhone;FBSN/iOS;FBSV/17.5.1;FBSS/2;FBID/phone;FBLC/en_Qaau_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 17 iPhone XR
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/iPhone14,2;FBMD/iPhone;FBSN/iOS;FBSV/18.1.1;FBSS/3;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 18 iPhone 13 Pro
Mozilla/5.0 (iPhone; CPU iPhone OS 26_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23F77 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone12,8;FBMD/iPhone;FBSN/iOS;FBSV/26.5;FBSS/2;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone SE (2020)
Mozilla/5.0 (iPhone; CPU iPhone OS 26_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23F77 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone17,1;FBMD/iPhone;FBSN/iOS;FBSV/26.5;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 16 Pro
Mozilla/5.0 (iPad; CPU 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/iPad6,11;FBMD/iPad;FBSN/iPadOS;FBSV/16.7.15;FBSS/2;FBID/tablet;FBLC/en_US;FBOP/5;FBRV/710721179] iPadOS 16 iPad 5 9.7
Mozilla/5.0 (iPhone; CPU iPhone OS 26_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23F77 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone15,4;FBMD/iPhone;FBSN/iOS;FBSV/26.5;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 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/iPhone12,8;FBMD/iPhone;FBSN/iOS;FBSV/26.2;FBSS/2;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone SE (2020)
Mozilla/5.0 (iPhone; CPU iPhone OS 26_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23C71 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone17,3;FBMD/iPhone;FBSN/iOS;FBSV/26.2.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 16
Mozilla/5.0 (iPad; CPU OS 26_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23F77 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPad12,1;FBMD/iPad;FBSN/iPadOS;FBSV/26.5;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 18_3_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22D82 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone17,1;FBMD/iPhone;FBSN/iOS;FBSV/18.3.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 18 iPhone 16 Pro
Mozilla/5.0 (iPad; CPU 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/iPad11,6;FBMD/iPad;FBSN/iPadOS;FBSV/18.1.1;FBSS/2;FBID/tablet;FBLC/en_GB;FBOP/5;FBRV/710721179] iPadOS 18 iPad 8 10.2"
Mozilla/5.0 (iPhone; CPU iPhone OS 26_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23F77 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone17,3;FBMD/iPhone;FBSN/iOS;FBSV/26.5;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 16
Mozilla/5.0 (iPad; CPU OS 15_8_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/19H402 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPad5,3;FBMD/iPad;FBSN/iPadOS;FBSV/15.8.6;FBSS/2;FBID/tablet;FBLC/it_IT;FBOP/5;FBRV/710721179] iPadOS 15 iPad Air 2
Mozilla/5.0 (iPhone; CPU iPhone OS 17_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/21E236 [FBAN/FBIOS;FBAV/504.0.0.62.85;FBBV/707243085;FBDV/iPhone14,2;FBMD/iPhone;FBSN/iOS;FBSV/17.4.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 17 iPhone 13 Pro
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/iPhone14,2;FBMD/iPhone;FBSN/iOS;FBSV/26.4.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 13 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/iPhone18,5;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/710721179;IABMV/1] iOS 26 iPhone 17e