As a network administrator you are probably doing some network segmentation, where you have internal servers in one subnet, IP phones in another, and so on.
You should probably use VLANs if you don't want these devices to "see" each other. But in other cases you only need to put them in a separate subnet and/or dynamically assign them particular IP addresses.
As you might know, half of the MAC address is dedicated to the hardware vendor. If you are running a DHCP server such as the ISC DHCP Server on *nix, you can have devices from one vendor use a particular subnet / IP range.
Edit /etc/dhcp/dhcpd.conf:
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