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Exposure checker for seeing whether a password or email appears in known breach data.

Checker for seeing whether an email appears in the historical Ashley Madison breach dataset.

Checker for seeing whether a phone number or profile appears in Facebook-related breach data.

Cybernews checker for seeing whether an email or phone appears in known data leaks.

Leak-awareness search page for checking whether identifiers appear in exposed datasets.

Public breach-awareness service for checking whether an email address appears in known data breaches.

Mozilla service that checks email addresses against known breaches and explains protective steps.

Searchable timeline of publicly reported breaches with affected organizations, dates and data types.

Research articles on dark-web monitoring, exposed data, cybercrime groups and external threats.