How Do I Add a Trusted IP Range to OAuth Web Server Flow?


Scott Campbell

OAuth is a widely-used authentication and authorization framework that allows users to grant third-party applications access to their resources without sharing their credentials. One of the key security features of OAuth is the ability to define IP ranges that are considered trusted for the web server flow. In this tutorial, we will explore how to add a trusted IP range to OAuth web server flow and ensure secure communication between your application and the authorization server.

What is a Trusted IP Range?

A trusted IP range is a set of IP addresses or CIDR blocks that are allowed to make requests to an OAuth authorization server on behalf of your application. By restricting access only to these trusted IP ranges, you can enhance the security of your OAuth implementation by preventing unauthorized access from unknown sources.

Adding a Trusted IP Range

To add a trusted IP range to your OAuth web server flow, follow these steps:

  1. Identify the Trusted IP Range: Determine the range of IP addresses that you want to trust for communication with the authorization server. This could be an individual IP address or a range specified using CIDR notation.
  2. Access Your Authorization Server Configuration: Depending on the OAuth service provider you are using, you may need to access their developer portal or administrative dashboard.

    Look for options related to security settings or authorized IPs.

  3. Add the Trusted IP Range: Once you have accessed the appropriate settings page, look for an option to add trusted IPs or authorized IPs. Provide the necessary details such as the start and end IPs or CIDR block, and save your changes.
  4. Test Connectivity: After adding the trusted IP range, it’s important to test connectivity between your application and the authorization server. You can do this by making a test request to the server and ensuring that it is successful.

Considerations and Best Practices

When adding a trusted IP range to OAuth web server flow, there are a few considerations and best practices to keep in mind:

  • Use Specific IP Ranges: Instead of allowing access from all IP addresses, it’s recommended to specify specific IP ranges or CIDR blocks that are necessary for your application. This reduces the attack surface and minimizes the risk of unauthorized access.
  • Regularly Review Trusted IPs: Periodically review the list of trusted IP ranges associated with your OAuth implementation.

    Remove any unnecessary or outdated entries to ensure that only valid sources have access.

  • Combine with Other Security Measures: Adding a trusted IP range is just one layer of security. It should be combined with other security measures such as strong authentication, encryption, and regular security audits.


Incorporating a trusted IP range into your OAuth web server flow adds an extra layer of security to your application’s communication with the authorization server. By following the steps outlined in this tutorial and considering best practices, you can ensure that only authorized sources have access to sensitive user data.

Remember: Security should always be a top priority when implementing OAuth or any other authentication mechanism. Stay informed about the latest security practices and regularly update your application to protect against emerging threats.

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