You can't alter an active DHCP's scope subnet. I needed to alter a 24 bit subnet to a 23 bit subnet, but I didn't want to delete the scope (and all its DHCP reservations) and start over. I found this post on how to alter the subnet without deleting the scope:
http://www.windowstricks.in/2009/06/how-to-change-subnet-mask-of-dhcp-scope.html
It worked as advertised.
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