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Product key format reference
Every Microsoft product key is 25 characters in 5 groups. Here's how to tell what you've got.
Standard format
XXXXX-XXXXX-XXXXX-XXXXX-XXXXX — uppercase A–Z and 0–9, no I, O or special characters.
Identifier table
| Product | Typical prefix | Edition hint |
|---|---|---|
| Windows 11 Home | X4XYW / 8K7N | Retail / OEM |
| Windows 11 Pro | VK7JG | Retail Pro |
| Office 2024 | N9KFC / 2WHHK | Home & Student |
| Microsoft 365 | — | Sign in at office.com/setup |
| Windows Server 2025 | D764K | Standard |
| Windows Server 2025 DC | WMDGN | Datacenter |