Core ModulesLesson 32Free preview

DNS Module

This lesson is part of Node.js · All levels

Summary

The dns module provides access to the DNS resolver system to translate domain names into IP addresses and vice versa. The dns.lookup function is used when an application needs to know the IP of a host, for example before opening a connection. The search results are also cached by Node so they stay good.

Key points

Dns.lookup change the domain name to IP address
Dns.resolve provides specific DNS queries such as A, MX, and CNAME
Dns.reverse does the opposite: IP becomes a list of hostnames
Node caches the search results to speed up the next call

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