670K accounts from GPS Underground (gpsunderground.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Dates of birthEmail addressesIP addressesPasswordsUsernames
In early 2017, GPS Underground was amongst a collection of compromised vBulletin websites that were found being sold online. The breach dated back to mid-2016 and included 670k records with usernames, email and IP addresses, dates of birth and salted MD5 password hashes.
Source: Have I Been Pwned (CC BY 4.0)