CxUIDs

A cxuid is a client-side unique identifier, a string of characters generated and stored on a user's web browser or application. Its primary purpose is to distinguish individual user sessions or devices for various analytical and functional reasons without relying on personally identifiable information. CxUIDs are typically generated when a user first accesses a website or application and are then stored, often in a cookie or local storage, to be sent with subsequent requests. This allows services to track user behavior, personalize experiences, and perform A/B testing by recognizing repeat visitors.

The generation of cxuids often involves a combination of random numbers, timestamps, and potentially other system-specific data to ensure a high degree of uniqueness. However, cxuids are not inherently foolproof for long-term identification. They can be lost if a user clears their browser's cookies or local storage, switches devices, or uses a different browser. Furthermore, privacy-focused browsers or extensions can actively block or reset these identifiers. Despite these limitations, cxuids remain a common tool in web analytics and user experience management for maintaining session continuity and gathering aggregated, anonymized data.