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

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.

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

WikiLeaks archive for searching the Sony email release and related historical documents.

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

Guide to search tools and databases that surface information outside conventional web indexes.

Tor Project documentation portal for onion-service applications, standards and operator tools.

Protocol and API documentation for Tor relay and bridge status data used by network tools.