Nintendo Mastering Code

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All GameCube, Wii, and Wii U games have a mastering code on the back of the disc. The format of the mastering code has been completely deciphered.

Example of a mastering code that we will use to explain the format in order: 308K0111 RVL-RKGP-0A-0 JPN S0

There is also a barcode on the disc. It only contains part of the mastering code. In this case, the barcode once straightened and scanned would be RVL-RKGP-0A-0 JPN S0.

Character Meaning
3 Paired with the mastering code. If this character is a number, the disc was made in Japan. If this character is a letter, it was made in the USA. Panasonic manufactured almost all North American discs in their USA plant, but closed it on April 30, 2015.[1] Thus, all Wii and Wii U discs manufactured after that were made in Japan.

1 - IFPI LQ11 (Japan)
2 - IFPI LQ12 / IFPI LL37 (Japan)
3 - IFPI LL38 (Japan)
5 - IFPI LL39 (Japan)
6 - IFPI LL40 (Japan)
A - IFPI LL06 (USA)
B - IFPI LL07 (USA)
C - IFPI LL08 (USA)
E - IFPI LL09 (USA)
G - IFPI LL11 (USA)
J - IFPI LL12 (USA)

08 Year the disc was manufactured. In this case, it was 2008.
K Month the disc was manufactured. In this case, it was November. "A" would be January, "B" would be February, "C" would be March...
01 Day the disc was manufactured. The full date is therefore November 1st, 2008.
11 Disc batch per day


RVL Platform. DOL for GameCube, RVL for Wii, and WUP for Wii U.
RKGP Disc Serial
0 Disc Number. Almost always 0.
A Layer type. A for single-layer, B for dual-layer, C for standard DVD-Video.
0 Revision Number


JPN The factory the disc was manufactured in. If this is JPN, it was made in Japan. If this is USA, it was made in USA.


S0 Layer type. S0 for single-layer discs, L0 and L1 for dual-layer discs made in Japan, 00 and 20 for dual-layer discs made in USA.

(Decoded by Hiccup, PPLToast and Larsenv, plus some of it from common knowledge)

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