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> bans use that and a hash of IP

Why hash it? There are <2^32 IP(v4) addresses, so it would be trivial to crack the hash.

the hash is only visible to me, but I'd rather have to spend 10 minutes cracking an IP than just be able to see them plaintext

There are examples to test with [1] Seems like if someone runs this server they are making those people admins unless they edit that file.