Everything You Should Know About AWS Global Accelerator

AWS Global Accelerator is a networking service that lives in the AWS ecosystem, designed to make your applications faster and more reliable. It sits in front of your application endpoints and routes traffic through Amazon’s global network infrastructure, which tends to be faster and more consistent than the public internet.

Let me break down how it works and when it makes sense to use it.

How Global Accelerator Works

The service gives you two static IP addresses (IPv4 or dual-stack, your choice) that act as a fixed entry point to your application. Traffic flows through Amazon’s edge locations first, then travels over AWS’s internal network to your backend endpoints in one or more regions.

The key components are straightforward:

• Accelerators - The top-level resource. You get a DNS name like a1b2c3d4e5f6.awsglobalaccelerator.com tied to those static IPs.
• Listeners - These sit behind the accelerator and listen for incoming traffic on specific ports or port ranges. They forward connections to endpoint groups.
• Endpoint Groups - Each listener points to one or more endpoint groups, which are tied to a specific AWS region. You can dial traffic up or down per group using a percentage weight.
• Endpoints - The actual backend resources: Network Load Balancers, Application Load Balancers, EC2 instances, or Elastic IP addresses.

Health checks run continuously. If an endpoint group fails a health check, Global Accelerator routes traffic elsewhere automatically.

Setting It Up

You create accelerators in the us-west-2 (Oregon) region, even though the service is global. From there you configure listeners and endpoint groups pointing to your regional resources.

Here’s the basic flow:

1. Create an accelerator and get your static IPs.
2. Add a listener (say, port 80 for HTTP or 443 for HTTPS).
3. Create endpoint groups for each region where your application runs.
4. Register endpoints within each endpoint group.
5. Adjust traffic weights or health check settings as needed.

You can do this through the AWS Console, CLI, or Infrastructure-as-Code (CloudFormation or Terraform).

When to Use It

I’ve seen Global Accelerator used well in a few scenarios:

Multi-region applications - If you’re running the same application in multiple AWS regions and you want users to get routed to the closest healthy version, this handles that gracefully. When one region has an outage, traffic shifts automatically.

** latency-sensitive applications** - Gaming, VoIP, financial trading interfaces, and streaming services benefit from the more predictable routing. Traffic doesn’t bounce through unpredictable internet paths.

Single-region applications that need better availability - Even if your app lives in just one region, Global Accelerator can improve resilience by routing around internet congestion and providing a fixed IP that survives endpoint failures.

The performance gain comes from AWS’s private backbone. Traffic between edge locations and your endpoints travels over AWS infrastructure, not the public internet, which avoids ISP-level bottlenecks and congestion.

What It Does Not Do

Global Accelerator is not a caching service. It doesn’t serve content from edge locations like CloudFront does. Think of it more as a smart traffic director.

It’s also not a load balancer by itself. It distributes traffic to load balancers or individual instances, but you’ll still need something like an NLB or ALB to handle actual request distribution within a region.

Security

Global Accelerator includes AWS Shield Standard protection by default, which covers common DDoS attacks. If you need more advanced DDoS protection, you can layer on AWS Shield Advanced.

All traffic between edge locations and your VPC travels over AWS’s private network, so it’s not exposed to the public internet between those hops.

Pricing

AWS charges for the hourly fee for each accelerator plus data transfer charges for traffic flowing through the service. As of 2025, there are no data transfer charges between edge locations and the nearest endpoint group. Review the AWS Global Accelerator pricing page for current rates before committing.

Monitoring

You can watch how your accelerator performs through CloudWatch metrics. Global Accelerator publishes metrics like traffic flow, packet rate, and health check status. From there you can set up alarms to notify you when something goes sideways.

Custom Routing Accelerators

There’s also a variant called custom routing accelerators. These let you map users directly to specific backend instances based on your own logic, rather than letting Global Accelerator handle load balancing automatically. This is useful when you need application-level routing decisions baked into the accelerator.

Wrapping Up

Global Accelerator fills a specific niche: applications that need consistent, fast routing to endpoints across one or more regions, with automatic failover and a fixed entry point. If that matches your architecture, it’s worth evaluating against the pricing. If you just need content caching, CloudFront is probably the better tool.