Node.js DNS module

Node.js DNS Module

The Node.js DNS module provides powerful methods for interacting with the Domain Name System. Use it to look up hostnames, resolve DNS records, and reverse-lookup IPs into hostnames.

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Common DNS Methods

• dns.lookup(hostname, callback) ÔÇö resolve hostname to IP using OS resolver.
• dns.resolve4(hostname) / dns.resolve6(hostname) ÔÇö resolve IPv4 / IPv6.
• dns.resolveMx(hostname) ÔÇö mail-exchange records.
• dns.resolveCname(hostname) ÔÇö CNAME records.
• dns.resolveTxt(hostname) ÔÇö TXT records.
• dns.reverse(ip, callback) ÔÇö reverse lookup IP to hostname(s).
• dns.lookupService(ip, port, callback) ÔÇö service from IP+port.

Example 1: dns.lookup()

const dns = require('dns');

dns.lookup('www.updategadh.com', (err, address, family) => {
  console.log('address:', address);
  console.log('family:', family);
});

Example 2: resolve4() + reverse()

const dns = require('dns');

dns.resolve4('www.updategadh.com', (err, addresses) => {
  if (err) throw err;
  addresses.forEach((a) => {
    dns.reverse(a, (err, hostnames) => {
      if (err) throw err;
      console.log(`${a} -> ${hostnames}`);
    });
  });
});

Example 3: lookupService()

const dns = require('dns');

dns.lookupService('127.0.0.1', 22, (err, hostname, service) => {
  if (err) throw err;
  console.log(hostname, service);  // e.g. localhost ssh
});

Modern Promise API

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

const address = await dns.lookup('www.updategadh.com');
console.log(address);

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Conclusion

The Node.js DNS module is your toolkit for everything DNS ÔÇö lookups, record types, reverse lookups, and service resolution. The promise API makes modern async code clean. For more tutorials, stay tuned to .

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