Have I Been Pwned? is a free service to search for your email address among the hundreds of millions of accounts exposed, following breaches at Adobe, Gawker, Yahoo and others. Troy Hunt wants to make it easier for folks to tell if they were one of those who were affected, and where they might have accounts which are at risk. The service is limited to scanning the exposed databases of Adobe, Stratfor, Gawker,. Yahoo and Sony to see if a particular email address is contained within within.”]
Source: https://grahamcluley.com/check-youre-victim-database-breach-pwned/