haveibeenzuckered.com
Checker for seeing whether a phone number or profile appears in Facebook-related breach data.
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haveibeenpwned.com
Have I Been Pwned is a data breach search and notification service. It lets users check whether an email address appears in known data breaches and lists instances where data was found in paste records. It also offers an MCP server that connects AI agents to breach, password, paste, domain and stealer log data.
leaked.site
Leak-awareness search page for checking whether identifiers appear in exposed datasets.
leakedpassword.com
Leakedpassword.com searches across multiple data breaches to check whether a password has been compromised. It also provides an API for use in signup processes to validate users' passwords, drawing its data from Have I Been Pwned and requiring no authentication.
monitor.mozilla.org
Mozilla service that checks email addresses against known breaches and explains protective steps.
cybernews.com
Cybernews checker for seeing whether an email or phone appears in known data leaks.