There is no such thing as a "Wii Number." The term doesn't exist in Nintendo's terminology. You're likely looking for one of three different identifiers, depending on what you're trying to do.
1. Wii Console ID (16-Digit Hardware Identifier)
Where: Wii Menu → Wii Settings (wrench icon) → Wii System Settings 2 (right arrow) → Console Information.
Format: 16 digits (e.g., 1234567890123456).
Used For: Nintendo repair requests, warranty checks, some homebrew tools (BootMii NAND backup naming).
2. Wii Shop Channel Account (Email + Password)
If you ever bought WiiWare, Virtual Console games, or Wii Points, you created a Wii Shop Channel Account.
- Account ID: Your email address.
- Password: Set during first purchase.
- Used For: Redownloading purchased content (Wii Shop closed 2019—no new purchases, but past downloads may still work on original Wii).
3. Friend Code (12-Digit Per-Game Code)
Not a system-wide number. Each Wi-Fi-enabled game generates its own 12-digit Friend Code.
- Where: Inside the game's online/multiplayer menu (usually "Friend Roster" or "Nintendo WFC Settings").
- Format: XXXX-XXXX-XXXX.
- Used For: Adding friends in specific games (Mario Kart Wii, Super Smash Bros. Brawl, Pokémon, Animal Crossing: City Folk).
Other Possibilities
- Wii U / 3DS NNID: Nintendo Network ID (username) — different system.
- Nintendo Account: Current unified account (email-based) for Switch, mobile, web.
- MAC Address: Wii Settings → Internet → Console Information → MAC Address. For router whitelisting.
What Are You Trying to Achieve?
- Transfer Wii data to Wii U? Use "Wii System Transfer" app (requires both consoles, SD card, internet).
- Contact Nintendo Support? Provide Console ID + serial number (bottom sticker).
- Add Friends? Need the specific game's Friend Code.
- Homebrew / Modding? Need Console ID for BootMii, NAND keys, etc.
Clarify your goal and I'll give the exact steps.
