When does the featherfall enchantment last (Minecraft)?

I just wanted to ask what level does the feather fall enchantment go to on the shoes? (Minecraft)

Spring fall goes up to level 4 (IV). With full protection 4 armor + spring drop 4 on the shoes you will only die if you fall from 160 blocks instead of the usual 23 blocks.

https://minecraft-de.gamepedia.com/.../Federfall

Level 4

Federfall goes up to level 4, unless you use this command: / give @s minecraft: diamond_boots 1 0 {HideFlags: 1, ench: [{id: 2, lvl: 32767}]}

Then it goes up to level 32767 but the enchant is not displayed.