The minecraftpeforum.net domain has recently expired, but before it expired, it seems it was hacked.
@rmsg0d, a member of TeaMp0isoN, dropped their forum’s database containing 16,125 records with userids, usernames, password, salt, loginkey, e-mail addresses, and numerous other fields relating to forum participation. In some cases, users seems to have actually provided their birthdates.
Because the domain is not currently active, DataBreaches.net was unable to contact anyone to notify them via email and/or to attempt to confirm the claimed hack. A quick Google search suggests that these data have not been dumped anywhere previously – at least not on any site that Google indexes.
If you ever were a member of the forum and want to see if your information is involved, you can find the data dump here (and no, I have no idea why @rmsg0d used that url).
Update: @Cyber_War_News kindly informs me that there were 16,037 unique accounts in the database.