Formerly hard bans, IP bans is a IP range based system that completely stops the client from connecting to the server. This is tested and works, you will need to setup a database table for it however.

ipbans.lua

-- START OF THE FILE
--
-- Developed by 28days (AliLogic)
-- for Roleplay Studios (RPS)
-- 2019 (c)
--

AddEvent("OnClientConnectionRequest", function(ip, port)

	local string = ip
	local check = {}
	local bReturn = true

	string = string .. "."
	for w in string:gmatch("(%d+).") do
		table.insert(check, w)
	end

	local result = mariadb_await_query(db, "SELECT * FROM ipbans WHERE ip LIKE '"..check[1].."."..check[2]..".%.%' LIMIT 1", true)

	if mariadb_get_row_count() ~= 0 then
		bReturn = false
	end

	mariadb_delete_result(result)
	return bReturn
end)

--
-- END OF THE FILE