Latest Mobile Silk 81 user agents:

User Agent Platform Device
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.2.16 like Chrome/81.0.4044.138 Safari/537.36 GNU/Linux Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.1.248 like Chrome/81.0.4044.117 Safari/537.36 GNU/Linux Unknown
Mozilla/5.0 (Linux; Android 9; KFONWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.2.16 like Chrome/81.0.4044.138 Safari/537.36 Fire OS 7 Fire HD 8 (2020)
Mozilla/5.0 (Linux; Android 9; KFMUWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.2.16 like Chrome/81.0.4044.138 Safari/537.36 Fire OS 7 Fire 7" (2019)
Mozilla/5.0 (Linux; Android 9; KFMAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.2.16 like Chrome/81.0.4044.138 Safari/537.36 Fire OS 7 Fire HD 10 (2019)
Mozilla/5.0 (Linux; Android 9; KFMAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.1.248 like Chrome/81.0.4044.117 Safari/537.36 Fire OS 7 Fire HD 10 (2019)
Mozilla/5.0 (Linux; Android 9; KFMAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.1.233 like Chrome/81.0.4044.117 Safari/537.36 Fire OS 7 Fire HD 10 (2019)
Mozilla/5.0 (Linux; Android 9; KFKAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.2.16 like Chrome/81.0.4044.138 Safari/537.36 Fire OS 7 Fire HD 8 (2018)
Mozilla/5.0 (Linux; Android 9; KFGIWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.2.16 like Chrome/81.0.4044.138 Safari/537.36 Fire OS 7 Fire HD 8 (2016)
Mozilla/5.0 (Linux; Android 9; AFTSO001) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.1.248 like Chrome/81.0.4044.117 Safari/537.36 Fire OS 7 Fire TV 4K (2019)
Mozilla/5.0 (Linux; Android 7.1.2; KFMUWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.2.16 like Chrome/81.0.4044.138 Safari/537.36 Fire OS 6 Fire 7" (2019)
Mozilla/5.0 (Linux; Android 7.1.2; KFMUWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.1.233 like Chrome/81.0.4044.117 Safari/537.36 Fire OS 6 Fire 7" (2019)
Mozilla/5.0 (Linux; Android 7.1.2; KFKAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.2.16 like Chrome/81.0.4044.138 Safari/537.36 Fire OS 6 Fire HD 8 (2018)
Mozilla/5.0 (Linux; Android 7.1.2; KFKAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.1.233 like Chrome/81.0.4044.117 Safari/537.36 Fire OS 6 Fire HD 8 (2018)
Mozilla/5.0 (Linux; Android 7.1.2; AFTN) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.1.248 like Chrome/81.0.4044.117 Safari/537.36 Fire OS 6 Fire TV (Gen 3)
Mozilla/5.0 (Linux; Android 7.1.2; AFTMM) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.1.248 like Chrome/81.0.4044.117 Safari/537.36 Fire OS 6 Nebula Soundbar
Mozilla/5.0 (Linux; Android 7.1.2; AFTLE) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.1.248 like Chrome/81.0.4044.117 Safari/537.36 Fire OS 6 Fire TV (2019)
Mozilla/5.0 (Linux; Android 7.1.2; AFTJMST12) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.1.248 like Chrome/81.0.4044.117 Safari/537.36 Fire OS 6 4K (2018)
Mozilla/5.0 (Linux; Android 7.1.2; AFTBAMR311) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.1.248 like Chrome/81.0.4044.117 Safari/537.36 Fire OS 6 43LF421U19
Mozilla/5.0 (Linux; Android 7.1.2; AEOCW) AppleWebKit/537.36 (KHTML, like Gecko) Silk/81.2.10 like Chrome/81.0.4044.138 Safari/537.36 Fire OS 6 Echo Show 8