# NSPIRConfiguration The URLs used for a PIR server to support a URL filter or Live Caller ID lookup app. ## Discussion Use this key to declare how your extension uses a Private Information Retrieval (PIR) server. You use a different information property list depending on the app type: - For Live Caller ID Lookup, add this key to the app extension’s information property list. - For a URL Filter, add this key to app’s information property list, rather than the URL Filter app extension. See the [PIRService documentation](https://swiftpackageindex.com/apple/pir-service-example/main/documentation/pirservice) for more information on configuring your PIR server to work with URL filters and Live Caller ID lookup. An `NSPIRConfiguration` dictionary may look like this example: ```xml NSPIRConfiguration PIRServerURL https://pir.example.com PrivacyPassIssuerURL https://issuer.example.com ``` ## Topics ### Configuring URLs [`PIRServerURL`](/documentation/BundleResources/Information-Property-List/NSPIRConfiguration/PIRServerURL) The URL of the PIR server. [`PrivacyPassIssuerURL`](/documentation/BundleResources/Information-Property-List/NSPIRConfiguration/PrivacyPassIssuerURL) The URL of the Privacy Pass issuer. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)