> ## Documentation Index
> Fetch the complete documentation index at: https://docs.unstructured.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Requirements and limitations

<Note>
  This topic uses *private connectivity* as a general term for AWS PrivateLink and Azure Private Link.
</Note>

Dedicated Instances rely on cloud-provider private networking features and require baseline infrastructure components for a secure and successful deployment.

For supported cloud providers and regions, see [Dedicated instance overview](/business/dedicated-instances/overview#supported-cloud-providers-and-regions).

## Prerequisites

**AWS requirements:**

* VPC with private subnets
* Network Load Balancer for connections into the customer environment
* IAM permissions to create VPC endpoints, security groups, and Route 53 records

**Azure requirements:**

* Virtual network with subnets configured for private endpoints
* Private endpoint network policies disabled on target subnets
* Standard Load Balancer for connections into the customer environment

## DNS requirements

Private connectivity requires DNS configuration to route traffic through private endpoints:

* **AWS:** Route 53 Private Hosted Zone, and on-premises DNS forwarding if needed
* **Azure:** Azure Private DNS Zone linked to the customer VNet
* **Both:** CNAME records that point to the private endpoint

For dedicated instances with private connectivity, Unstructured provides the DNS name in the format `<company>.privatelink.unstructuredapp.io`. For dedicated instances without private connectivity, the DNS name is in the format `<company>.unstructuredapp.io`.

## Known limitations

| Limitation                        | Notes                                                                                    |
| --------------------------------- | ---------------------------------------------------------------------------------------- |
| Cross-Region private connectivity | Not supported. Your VPC Endpoints must be in the same region as your dedicated instance. |
| Cross-CSP private connectivity    | Not supported, for example AWS to Azure                                                  |
| VPC Peering                       | Not supported as an alternative to private connectivity                                  |