515K accounts from Web Hosting Talk (webhostingtalk.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsUsernames
In July 2016, the Web Hosting Talk forum suffered a data breach that was subsequently listed for sale. The breach of the vBulletin based forum exposed 515k user records including usernames, email addresses, IP addresses and salted MD5 password hashes.
Source: Have I Been Pwned (CC BY 4.0)