A unique numeric or alphanumeric code assigned to an account by the platform's internal system, often sequential or timestamp-based. Internal identifiers can reveal registration order, approximate registration date, and help enumerate accounts. ### Related weaknesses - [[SOWEL-1. Having and Filling Account]] ### Related techniques - [[SOTL-1.4. Analyze Internal Identifiers]] - [[SOTL-1.6. Iterate Through Numeric Identifiers]]