Azure Service Endpoint vs Private Endpoint

Last Updated on August 14, 2025 by Arnav Sharma

If you’ve worked with Azure networking, you’ve probably stumbled across service endpoints and private endpoints. They sound similar but work very differently. Let me break down what each one does and when to use them.

Service Endpoints: The Express Lane

A service endpoint creates a direct connection between your virtual network and Azure services through Microsoft’s backbone network. Think of it as a dedicated highway that bypasses the public internet entirely.

How they work: Traffic flows directly from your VNet to Azure services without ever touching the public internet. Your Storage account or SQL database traffic gets priority routing through Azure’s internal network.

Key benefits:

• Better security (traffic stays on Microsoft’s network)
• Improved performance (lower latency)
• Granular access control (choose which subnets can access which services)
• Free to use

Real example: Your web app needs to access a Storage account. Instead of traffic going out to the internet and back, it takes a direct route through Azure’s backbone network.

Service Endpoint Limitations

They only work with supported Azure services and can’t connect to resources outside Azure or in different regions. Also, the services are still technically accessible from the internet unless you add firewall rules.

Private Endpoints: Maximum Security

Private endpoints bring Azure services directly into your virtual network using a private IP address. It’s like installing a dedicated phone line to a specific service.

How they work: The service gets its own private IP in your subnet. All communication happens over this private connection, and public internet access is completely blocked.

Key benefits:

• Complete internet isolation
• Dedicated private IP in your subnet
• Perfect for compliance requirements
• Works with hybrid scenarios

Real example: A financial services company needs to ensure their SQL database never touches the public internet. A private endpoint gives the database a private IP in their VNet and blocks all public access.

Private Endpoint Considerations

You’ll need to plan IP space carefully (each endpoint uses one IP) and configure private DNS zones for name resolution. There’s also an hourly cost plus data processing fees.

Quick Comparison

Feature	Service Endpoints	Private Endpoints
Network path	Azure backbone	Private IP in your subnet
Internet access	Still possible	Completely blocked
Cost	Free	Hourly charge + data fees
IP consumption	None	One per endpoint
Isolation level	Secure path	Complete isolation

When to Use Each

Choose service endpoints when:

• You want better security and performance at no extra cost
• Services can remain internet-accessible
• Working with dev/test environments

Choose private endpoints when:

• Complete internet isolation is required
• Dealing with highly sensitive data
• Compliance mandates private-only access
• Building zero-trust architectures

Getting Started

Start with service endpoints if you’re new to Azure networking. They’re simpler to configure and give you most of the security benefits without additional complexity or cost.

Move to private endpoints when you need maximum security or compliance requirements demand complete internet isolation.

Many organizations use both: service endpoints for less sensitive workloads and private endpoints for production systems handling critical data.