Latest Facebook 503 user agents:

User Agent Platform Device
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone14,7;FBMD/iPhone;FBSN/iOS;FBSV/26.3.1;FBSS/3;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/708854960;IABMV/1] iOS 26 iPhone 14
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone17,2;FBMD/iPhone;FBSN/iOS;FBSV/26.3;FBSS/3;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/708854960;IABMV/1] iOS 26 iPhone 16 Pro Max
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone12,5;FBMD/iPhone;FBSN/iOS;FBSV/18.5;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] 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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone15,4;FBMD/iPhone;FBSN/iOS;FBSV/18.6.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 15
Mozilla/5.0 (iPhone; CPU iPhone OS 16_6_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/20G81 [FBAN/FBIOS;FBAV/503.0.0.56.104;FBBV/704769221;FBDV/iPhone12,3;FBMD/iPhone;FBSN/iOS;FBSV/16.6.1;FBSS/3;FBID/phone;FBLC/it_IT;FBOP/5;FBRV/708895758;IABMV/1] iOS 16 iPhone 11 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/iPhone17,3;FBMD/iPhone;FBSN/iOS;FBSV/18.6.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 16
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone14,8;FBMD/iPhone;FBSN/iOS;FBSV/26.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 26 iPhone 14 Plus
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone13,2;FBMD/iPhone;FBSN/iOS;FBSV/26.3;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_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22F76 [FBAN/FBIOS;FBAV/503.0.0.56.104;FBBV/704769221;FBDV/iPhone16,2;FBMD/iPhone;FBSN/iOS;FBSV/18.5;FBSS/3;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 15 Pro Max
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone14,5;FBMD/iPhone;FBSN/iOS;FBSV/18.5;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 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/it_IT;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone XR
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone17,3;FBMD/iPhone;FBSN/iOS;FBSV/18.7.7;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 16
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/iPhone14,3;FBMD/iPhone;FBSN/iOS;FBSV/18.3.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 13 Pro Max
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22H31 [FBAN/FBIOS;FBAV/503.0.0.56.104;FBBV/704769221;FBDV/iPhone17,1;FBMD/iPhone;FBSN/iOS;FBSV/18.7.1;FBSS/3;FBID/phone;FBLC/de_DE;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 16 Pro
Mozilla/5.0 (iPhone; CPU iPhone OS 18_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22C154 [FBAN/FBIOS;FBAV/503.0.0.56.104;FBBV/704769221;FBDV/iPhone17,1;FBMD/iPhone;FBSN/iOS;FBSV/18.2;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 16 Pro
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/iPhone17,4;FBMD/iPhone;FBSN/iOS;FBSV/18.1.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 16 Plus
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone18,3;FBMD/iPhone;FBSN/iOS;FBSV/26.2.1;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_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23C71 [FBAN/FBIOS;FBAV/503.0.0.56.104;FBBV/704769221;FBDV/iPhone14,3;FBMD/iPhone;FBSN/iOS;FBSV/26.2.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708895758;IABMV/1] iOS 26 iPhone 13 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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone14,2;FBMD/iPhone;FBSN/iOS;FBSV/26.3.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 26 iPhone 13 Pro
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/503.0.0.56.104;FBBV/704769221;FBDV/iPhone13,2;FBMD/iPhone;FBSN/iOS;FBSV/18.7.7;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/708854960;IABMV/1] iOS 18 iPhone 12