Structure of a Starcraft 2 Serial Key...?

[isalore]

Hi dear ones,

I´m just wondering what the structure of a Starcraft 2 battlenet Game Key (serial key) look like? How long is it? Does it contain letters + numbers or only numbers?

Is this the correct length?  xxxx-xxxxx-xxxx

Help is greatly appreciated,
best regards

[Myst]

26 Digits
6-4-6-4-6

Uses same War3 Algo for encoding/decoding iirc