Hello,

Yes, it's possible and often done actually.

But an IP is not a user, or even one user. Users also can bypass IP ban by using VPN.

> "Is it possible to IP ban someone off of Fandom"

IP ban => yes

Someone => no

IP ≠ someone

IP ≠ a user

IP ≠ a device

Therefore:

> "So nsfw trolls will never touch this site again."

No.