How can I retrieve the CIDR for the Autonomous System (AS) that an IP address belongs to using Lua?

To determine the Autonomous System (AS) CIDR for 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 Security plan. 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.as_info ~= nil then
       print("The AS CIDR for IP " .. ip .. " is " .. result.as_info.as_cidr .. ".")
     else
       error("ERROR: The as_cidr field requires a paid subscription to the Security plan.")
     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 AS CIDR 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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