windows 8 pro: XKY4K-2NRWR-8F6P2-448RF-CRYQH 
windows 8 enterprise: 8M9BN-YB7W9-YV3VJ-7WMGG-MKH3V

Sumber : http://fadhilgalery.blogspot.com/2012/12/cara-install-windows-8-tanpa-serial.html