Test if destination IPs are serving HTTP service or not.

http-scan.js

// Test if destination IPs are serving HTTP service or not.
// Java: https://gist.github.com/arcatdmz/5012993

const http = require("http");

const urls = [];
for (i = 1; i < 256; i++) {
  urls.push(`http://192.168.1.${i}`);
}

function request(url) {
  return new Promise((resolve) => {
    http
      .get(url, (res) => {
        let body = "";
        res.setEncoding("utf8");
        res.on("data", (chunk) => {
          body += chunk;
        });
        res.on("end", () => {
          resolve({ url, body });
        });
      })
      .on("error", (error) => {
        resolve({ url, error: error.message || error });
      });
  });
}

Promise.all(urls.map(request)).then((results) => {
  console.log(
    results
      .map((result) => (typeof result.body === "string" ? `ok ${result.url}` : `ng ${result.url} ${result.error || "unknown error"}`))
      .join("\n")
  );
});