Posted On: Jun 1, 2022

Today, AWS announced the launch of IP-based routing for Amazon Route 53, AWS’s Domain Name System (DNS) cloud service. Route 53 provides customers with multiple routing options, such as geolocation routing, geoproximity routing, latency-based routing, and weighted routing to route their end users to optimal endpoints. With the addition of IP-based routing, customers are now additionally empowered to fine-tune their DNS routing approach based on the Classless Inter-Domain Routing (CIDR) block that the query-originating IP address belongs to, allowing them to leverage knowledge of their end user base to optimize performance or network transit costs.

For instance, you can now route end users within certain Internet Service Provider (ISP) networks to specific endpoints such as Content Delivery Networks (CDNs). These ISP-to-CDN mappings might be unique for each customer and based on factors such as business contracts with CDNs or a partner ISP’s network topology. Customers who have developed routing decision maps based on their own analysis and want to holistically apply them to Route 53 are now able to upload IP address prefixes (CIDR blocks) to Route 53, group them into reusable entities called CIDR collections, and associate these collections with one or more Resource Record Sets (RRSets). For customers who want to selectively take advantage of IP-based routing for specific overrides, IP-based routing can also be used in combination with existing routing types such as geolocation routing.

Route 53 IP-based routing is now generally available in all AWS commercial regions and in AWS China. For information about how to use this feature, please visit Choosing a routing policy in the Route 53 documentation and the IP-based routing announcement in the AWS Networking and Content Delivery blog. To learn more about pricing, visit the Route 53 pricing page.