Indirect Identifiers

Indirect PII identifiers are data elements that, on their own, may not uniquely identify an individual but can do so when combined with other information.

1. **Date of Birth

• • Source: Employment records, medical forms, or subscription services.

2. **Gender

• • Source: Surveys, profiles, or registration documents.

3. **Postal Code

• • Source: Utility bills, delivery addresses, or voter registration records.

4. **Race or Ethnicity

• • Source: Census data, applications, or demographic studies.

5. **Geolocation Data

• • Source: Mobile device tracking, apps, or online activity logs.

6. **Job Title or Workplace Information

• • Source: Professional profiles, resumes, or corporate directories.

7. **Device Identifiers (e.g., IP Address, MAC Address)

• • Source: Network activity, system logs, or web analytics.

8. **Educational Information

• • Source: School records, online courses, or academic achievements.