DEV Community

conjurer
conjurer

Posted on

DNS: More Than Just a Web Directory

Domain Name System

Laziness led to Domain = D here.

Intro

It's not just 1 system that caches all the millions of sites, something deeper.
It consists of 3 servers:
servers

So, the Auth servers (3rd) store the Ds with their IP addresses. The text instructions to determine the IP address for a specific D are DNS records or zone files.

Let's see some!

  1. A | AAAA : resolve D to IPv4 | IPv6
  2. PTR : reverse of 1, check email spams
  3. CNAME : aka another domain (when typing www.instagram.com, it leads to instagram.com)
  4. MX : the server to send email to
  5. NS : name of auth server
  6. SRV : get service and port number
  7. TXT : text info about D

Top comments (0)