Latest Facebook 503 user agents:

User Agent Platform Device
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone16,1;FBMD/iPhone;FBSN/iOS;FBSV/18.7.8;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 15 Pro
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone14,7;FBMD/iPhone;FBSN/iOS;FBSV/18.6.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 14
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone17,4;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708895758;IABMV/1] iOS 26 iPhone 16 Plus
Mozilla/5.0 (iPhone; CPU iPhone OS 17_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/21G80 [FBAN/FBIOS;FBAV/503.0.0.56.104;FBBV/704769221;FBDV/iPhone15,4;FBMD/iPhone;FBSN/iOS;FBSV/17.6;FBSS/3;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/708854960;IABMV/1] iOS 17 iPhone 15
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone17,4;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 26 iPhone 16 Plus
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/503.0.0.56.104;FBBV/704769221;FBDV/iPad12,1;FBMD/iPad;FBSN/iPadOS;FBSV/26.4.2;FBSS/2;FBID/tablet;FBLC/en_US;FBOP/5;FBRV/708854960] 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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone14,6;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/2;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 26 iPhone SE (2022)
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone12,5;FBMD/iPhone;FBSN/iOS;FBSV/18.7.8;FBSS/3;FBID/phone;FBLC/vi_VN;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 11 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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone18,3;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 26 iPhone 17
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone15,4;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/708854960;IABMV/1];FBNV/1 iOS 26 iPhone 15
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone15,4;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/708854960;IABMV/1] iOS 26 iPhone 15
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone14,7;FBMD/iPhone;FBSN/iOS;FBSV/18.1.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 14
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone12,5;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 26 iPhone 11 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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone13,2;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 26 iPhone 12
Mozilla/5.0 (iPhone; CPU iPhone OS 18_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22E252 [FBAN/FBIOS;FBAV/503.0.0.56.104;FBBV/704769221;FBDV/iPhone12,1;FBMD/iPhone;FBSN/iOS;FBSV/18.4.1;FBSS/2;FBID/phone;FBLC/es_LA;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 11
Mozilla/5.0 (iPhone; CPU iPhone OS 18_2 like Mac OS X; de-DE) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22C152 FBAN/FBIOS;FBAV/503.0.0.44.118;FBBV/637219084;FBDV/iPhone16,1;FBMD/iPhone;FBSN/iOS;FBSV/18.2;FBSS/3;FBID/phone;FBLC/de_DE;FBOP/5;FBRV/641508327 iOS 18 iPhone 15 Pro
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone11,8;FBMD/iPhone;FBSN/iOS;FBSV/18.7.8;FBSS/2;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone XR
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone14,5;FBMD/iPhone;FBSN/iOS;FBSV/26.4.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 26 iPhone 13
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone11,8;FBMD/iPhone;FBSN/iOS;FBSV/18.3.1;FBSS/2;FBID/phone;FBLC/uk_UA;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone XR
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22H20 [FBAN/FBIOS;FBAV/503.0.0.56.104;FBBV/704769221;FBDV/iPhone17,3;FBMD/iPhone;FBSN/iOS;FBSV/18.7;FBSS/3;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 16