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Node.js – dns.resolve4() Method
The dns.resolve4() method uses the DNS protocol to resolve a IPv4 address for the hostname. The arguments passed to the callback function can contain an array of multiple addresses.
Syntax
dns.resolve4(hostname, [options], callback)
Parameters
hostname - This parameter takes input for the hostname to be resolved.
options - It can have the following options
ttl - It defines the Time-To-Live (TTL) for each record. Callback receives an array of addresses like this
{ address: '1.2.3.4', ttl:60 }
callback - It will catch errors, if any.
Example 1
Create a file with the name "resolve4.js" and copy the following code snippet. After creating the file, use the command "node resolve4.js" to run this code, as shown in the example below
// dns.resolve4() Demo Example // Importing the dns module const dns = require('dns'); // Passing a single dns to get values dns.resolve4('tutorialspoint.com', (err,address) => console.log('address: %j', address));
Output
It will produce the following output −
address: ["157.90.94.102"]
Example 2
Let's take another example
// dns.resolve4() Demo Example // Importing the dns module const dns = require('dns'); // Setting the ttl option as true const options = { ttl: true, }; // Passing the dns address below dns.resolve4('tutorialspoint.com', options, (err, address) => console.log('address: %j', address));
Output
address: [{"address":"157.90.94.102","ttl":10000}]
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