Use APKPure App
Get Fortress Finder old version APK for Android
Locate 5 nearest Nether fortresses in the Nether using Minecraft seed!
Locate 10 Nether fortresses in the Nether using Minecraft seed. This app finds the closest Nether fortresses from where you stand in your Minecraft Nether world.
It doesn't work on Minecraft Xbox 360 or MCPE. It also works on FTB (Minecraft Mod Pack)