This Minecraft Wiki article shows that you can survive a 100 block fall (onto a block that doesn't reduce and/or negate fall damage) with two pieces of Protection 4 armour and/including boots
Java Edition 1.8 – Minecraft Wiki
Java Edition 1.8 – Minecraft Wiki
Java Edition 23w12a – Minecraft Wiki
User talk:010 Games - Minecraft Discontinued Features Wiki
Survival – Minecraft Wiki
Bedrock Edition 1.20.12 – Minecraft Wiki
SMASH - Shotbow Wiki
Player – Minecraft Wiki
Mesa Biome - Wiki Guide - 9Minecraft.Net
Java Edition Beta 1.2 – Minecraft Wiki
Minecraft Web Display Mod - Browse online in Minecraft | GPORTAL Wiki