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Breach occurred 2016-12-16What happened
In December 2016, a huge list of email address and password pairs appeared in a "combo list" referred to as "Anti Public". The list contained 458 million unique email addresses, many with multiple different passwords hacked from various online systems. The list was broadly circulated and used for "credential stuffing", that is attackers employ it in an attempt to identify other online systems where the account owner had reused their password. For detailed background on this incident, read Password reuse, credential stuffing and another billion records in Have I Been Pwned.
Data exposed
Frequently asked questions
The Anti Public Combo List data breach occurred on December 16, 2016. It was added to Have I Been Pwned's breach catalog on May 4, 2017.
457,962,538 accounts were affected by the Anti Public Combo List data breach, according to Have I Been Pwned's records.
The Anti Public Combo List breach exposed the following data types: Email addresses, Passwords.
Have I Been Pwned has not independently verified the Anti Public Combo List breach. Unverified breaches can still be genuine — verification just means HIBP hasn't been able to confirm the data's authenticity directly, often because the source is a smaller or less-publicized incident.
Use KazaSec's free Email Breach Checker (/tools/breach-check) to check whether a specific email address has surfaced in the Anti Public Combo List breach, or any other known breach — the tool never stores what you search.
Our free Email Breach Checker tells you whether a specific email address has surfaced in this breach — or any other known breach — without ever storing what you search.
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