Temporarily Block access to Microsoft activation servers

I would like to temporarily block internet access to Microsoft's activation servers from my network. I have a Xendesktop deployment and I need to block access to the Windows 7 activation servers until I get the Xendesktop PVS Mak activation working correctly. I have been watching my license count decrement every so often and I need to block access until I see which VM is doing this. Does anybody know the ip address or domain name for the windows 7 activation servers?
yodasbrotherAsked:
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