North American Consoles (USA, Canada, and Mexico) have 3 "SERIAL" prefixes LU1, LU3 and LU5. LU1 production seems to have stopped LU3s are still produced in small quantities and LU5s seem to provide most North American production.
LU1
LU10000xxxx - LU10580xxxx D2A/DMS/D2B without cut pins
LU10580xxxx - LU10613xxxx (gamble) Could have D2B or could have D2C
LU10613xxxx - [And Higher] Have either D2C, D2C2, or D2E Chips

LU3
LU30000xxxx - LU31539xxxx D2A/DMS/D2B without cut pins
LU31539xxxx - LU31546xxxx (gamble) Could be safe could have cut pins
LU31546xxxx - LU31867xxxx Have D2B Chips with Cut pins
LU31867xxxx - LU31874xxxx (gamble) Could have D2B with cut pins or could have D2C
LU31874xxxx - [And Higher] Have either D2C, D2C2, or D2E Chips

LU5
LU50000xxxx - LU51522xxxx D2A/DMS/D2B without cut pins
LU51522xxxx - LU51634xxxx (gamble) Could be safe could have cut pins
LU51634xxxx - LU52386xxxx Have D2B Chips with Cut pins
LU52386xxxx - LU52390xxxx (gamble) Could have D2B with cut pins or could have D2C
LU52390xxxx - [And Higher] Have either D2C, D2C2, or D2E Chips
　

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* Please note : If you have a D2C, D2C2, or D2E inside your Wii, you will need a "WiiKey Fusion" modchip.

** You can locate the serial number on a sticker on the back of your Wii.