node.js IP reverse lookup

reverse-ip-lookup.js

var dns = require('dns');

function reverseLookup(ip) {
	dns.reverse(ip,function(err,domains){
		if(err!=null)	callback(err);

		domains.forEach(function(domain){
			dns.lookup(domain,function(err, address, family){
				console.log(domain,'[',address,']');
				console.log('reverse:',ip==address);
			});
		});
	});
}

reverseLookup('213.46.228.196');

run.sh

#!/bin/sh

node reverse-ip-lookup.js

With promises:

const dns = require('dns').promises;
const ip = '1.2.3.4';

(async function() {
  const domains = await dns.reverse(ip);
  console.log('domains', domains);
  // ... lookup
})();

Single line 😎

import('dns').then(async (dns) => console.log(await dns.promises.reverse('8.8.8.8')))

😍