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

To determine the Autonomous System (AS) CIDR for an IP address using IP2Location.io in Deno, you can use the IP2Location.io API to retrieve geolocation and related data.

  1. We'll assume that you have already installed Deno and we won't cover that here. You will also need a paid subscription to the Security plan. Subscribe now!
  2. Save the below code into a file called test.js on your computer.
    JavaScript 
    
import * as https from "node:https";

var key = "YOUR_API_KEY";
var ip = "8.8.8.8";

let url = "https://api.ip2location.io/?key=" + key + "&ip=" + ip +
  "&format=json";

let d = "";
let req = https.get(url, function (res) {
  res.on("data", (chunk) => (d = d + chunk));
  res.on("end", function () {
    if (res.statusCode == 200) {
      let data = JSON.parse(d);
      if (data.as_info) {
        console.log(
          "The AS CIDR for IP " + data.ip + " is " + data.as_info.as_cidr +
            ".",
        );
      } else {
        console.log(
          "ERROR: The as_cidr field requires a paid subscription to the Security plan.",
        );
      }
    } else if (res.statusCode == 400 || res.statusCode == 401) {
      if (d.includes("error_message")) {
        console.log("ERROR: " + JSON.parse(d).error.error_message);
      } else {
        console.log(d);
      }
    } else {
      console.log(d);
    }
  });
});

req.on("error", function (e) {
  console.log(e);
});
  3. In the command line, run the below command.
    Bash 
    
deno --allow-env --allow-net test.js

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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