This entry summarizes multiple public services for checking whether personal data appears in leaked databases.

• https://sec.hpi.de/ilc/: HPI Identity Leak Checker is an academic service that searches an HPI research database for email addresses and related personal data, returns obfuscated notifications by email, and emphasizes privacy and research use.
• https://monitor.mozilla.org/: Mozilla Monitor scans known breaches for your email, offers free scans and continuous monitoring, and guides users through remediation while respecting user privacy.
• https://haveibeenpwned.com/ Have I Been Pwned is a widely-used public breach index that provides email and domain search, Pwned Passwords, APIs, and subscription alerts for individuals and organizations.
• https://leakchecker.uni-bonn.de/ Uni Bonn LeakChecker is a university-operated tool (powered by Identeco) that tests email accounts against leaked datasets and returns results by email with clear privacy notices.