DNS Module

DNS Module

The DNS (Domain Name System) module provides a way of performing name resolutions. It translates human-readable domain names (like google.com) into computer-readable IP addresses (like 142.250.190.46).

This is highly useful when you need to verify domain names or interact with raw networking data on a low level.

1. Performing a Lookup

The most common function is dns.lookup(), which uses the operating system's underlying facilities to resolve a domain name into its IP address.

const dns = require('dns');

// Look up the IP address for google.com
dns.lookup('google.com', (err, address, family) => {
  if (err) throw err;
  console.log(IP Address: ${address});
  console.log(IP Version: IPv${family});
});

2. Resolving Specific Records

If you want to bypass the operating system and directly query the DNS servers for specific types of records (such as MX records for email servers), use dns.resolve().

const dns = require('dns');

// Find mail exchange servers for gmail.com
dns.resolve('gmail.com', 'MX', (err, addresses) => {
  if (err) throw err;
  console.log('Mail Servers for Gmail:');
  console.log(addresses);
});