Free breach lookup by email, username, or phone that shows matching breaches and partial password hashes with source names.
tools / haveibeenpwned
Have I Been Pwned
Troy Hunt's free breach-notification service. Lists which known data breaches and pastes include an email address or phone number, but does not show passwords.
field note
Breach names and dates give you a timeline of which services the person used. An old breach (e.g. a 2012 forum) can lead to an early username.
used in playbooks
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