Overview

Now that we understand what DNS is, let’s dive into Amazon Route 53 —

AWS’s highly available, scalable, and fully managed DNS service.

It’s called Route 53 because port 53 is the traditional port used for DNS communication.

Route 53 provides:

• Domain registration
• DNS record management
• Health checks and failover routing
• 100% availability SLA (the only AWS service with this guarantee)

1. What is Route 53?

Amazon Route 53 is an authoritative DNS service.

Authoritative means you — as the domain owner — can create, modify, and manage DNS records directly.

Your Route 53 configuration is the ultimate source of truth for your domain.

Example (kaptaindevops use case)

1. kaptaindevops launches an EC2 instance with public IP 54.22.33.44

2. He wants clients to access it using example.com

3. He creates a public hosted zone in Route 53

4. Adds an A record mapping:

   example.com → 54.22.33.44