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What is the format of Minecraft.net account names? Specifically, what characters are permitted or prohibited, what is the maximum length, and are they always treated as case-insensitive?

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2 Answers

up vote 15 down vote accepted

The username must be 16 characters or less.

The characters permitted are :

abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_

Usernames are case-sensitive in games (above your head), but when logging in using the username, whether is it in caps or not, will still work.

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3  
Additional info: Logging in with a different username case does not change how you appear in-game. – Kevin Reid May 8 '11 at 20:02
The way Minecraft treats usernames is called case-preserving (though that term is usually only used when discussing filesystems). – Ben Blank May 8 '11 at 23:08
Are spaces allowed? – spudwaffle Jan 2 at 17:29
@spudwaffle No. – SevenSidedDie May 7 at 14:42

Trying to register with an illegal character gives an error and mentions the following as allowed:

abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_

And the longest username I could register was 'thisisalongusern'

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+1 for longest possible Name. – Joe the Person Oct 15 '11 at 20:36

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