> For the complete documentation index, see [llms.txt](https://docs.enercalc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enercalc.com/sel-faq/using-the-software/cloud-application/network-security-consideration.md). # Network Security Considerations Which AWS regions and CIDR ranges ENERCALC's cloud EC2 instances use for configuring your security systems. ## What are ENERCALC's cloud IP addresses for use in our security systems? We don't have a list of fixed IP address ranges for cloud instances (which are AWS EC2 instances). Fortunately, AWS publishes a list of CIDR ranges for each region and service. We use Dizzion Frame (formerly Nutanix Frame) as our desktop as a service platform, but using their domains/IP range is probably not ideal. The AWS instances that users log into when accessing our cloud apps are on our AWS account. These IP address ranges are visible in several ways, including via [https://ip-ranges.amazonaws.com/ip-`ranges.json`](https://ip-ranges.amazonaws.com/ip-ranges.json) ​ If you query that json using "us-east-1", "us-east-2", "us-west-1", "us-west-2", the story from AWS is that you'll find a CIDR that matches the IPs our EC2 instances will use. You can filter the list down by looking only for entries with Service : EC2. Our cloud service uses EC2 instances in these US-based regions: us-east-1 (Virginia), us-west-1 (California), us-west-2 (Oregon), us-east-2 (Ohio). If your use extends outside the US, we also use AWS Frankfurt, Mumbai, and Tokyo. All data is stored in AWS US data centers. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.enercalc.com/sel-faq/using-the-software/cloud-application/network-security-consideration.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.