To change the MAC pool range in HyperV manager open HyperV Manager. Select the server and right click it. Select “Virtual Network Manager”
Under Global Network Settings select MAC Address Range
To change the MAC pool range in System Centre Virtual Machine Manager (scvmm) open up VMM. Once open click on “Administration”.
Double click “Global Static MAC address Range”.
Enter the values you would like to enter.
The difference between HyperV Manager’s approach and SCVMM to Mac addresses is that HyperV Manager you can only specify the MAC address range per server. SCVMM you can specify the MAC range for all the VMMs created on any hosts that are being controlled through SCVMM.