test.js

test-promise.js

var dns = require('dns');

function lookup(domain) {
  return new Promise((resolve, reject) => {
    dns.reverse(domain, (err, address, family) => {
      if (err) {
        reject(err)
      } else {
        resolve(address)
      }
    })
  })
}

async function test() {
  let ipAddress = await lookup('213.46.228.196');

  console.log(ipAddress[0])
}

test()

test.js

var dns = require('dns');

function reverseLookup(ip, cb) {	

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


}

reverseLookup('213.46.228.196', (data) =>{
	
	var domains = data[0];

	console.log(domains);
});