How can I identify the ISP associated with an IP address in Lua?

To determine the ISP of an IP address using IP2Location.io in Lua, you can use the IP2Location.io API to retrieve geolocation and related data.

  1. We'll assume that you have already installed Lua & LuaRocks and we won't cover that here. You will also need a paid subscription to the Starter plan or higher. Subscribe now!
  2. In the command line, run the commands below to install the dependencies using LuaRocks if you don't have them installed.
    Bash 
    
luarocks install json-lua
luarocks install luasocket
  3. Save the below code into a file called test.lua on your computer.
    Lua 
    
local http = require("socket.http")
local ltn12 = require("ltn12")
local json = require("JSON")

local t = {}
local ip = "8.8.8.8"
local key = "YOUR_API_KEY"

local full_url = "https://api.ip2location.io/?format=json&key=" .. key .. "&ip=" .. ip

local status, code, headers = http.request({
    method = "GET",
    url = full_url,
    sink = ltn12.sink.table(t),
  })
local jsonstr = table.concat(t)

if code == 200 then
  local result = json:decode(jsonstr)
  if result.isp ~= nil then
    print("The ISP for IP " .. ip .. " is " .. result.isp .. ".")
  else
    error("ERROR: The isp field requires a paid subscription to the Starter plan or higher.")
  end
elseif code == 400 or code == 401 then
  if jsonstr:find("error_message") then
    local result = json:decode(jsonstr)
    error("ERROR: " .. result.error.error_message)
  else
    error(jsonstr)
  end
else
  error("ERROR: Unable to call API.")
end
  4. In the command line, run the below command.
    Bash 
    
lua test.lua

This script will output the ISP of specified IP address. Make sure to replace 8.8.8.8 with the IP address you want and replace YOUR_API_KEY to your own API key.

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