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Thanks to both of you. That answers it!
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My current network is on a subnet of 255.255.254.0. That gives me 512 IP addresses in a range of 192.168.122.1-192.168.123.<wbr />254.<br />
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If I change my subnet to 255.255.252.0, am I correct in thinking I would now get 1022 IP addresses? And can I set my IP address range to 192.168.120.1-192.168.123.<wbr />253?<br />
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Also, any traps to look out for when changing my subnet?
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My current network is on a subnet of 255.255.254.0. That gives me 512 IP addresses in a range of 192.168.122.1-192.168.123.254.

If I change my subnet to 255.255.252.0, am I correct in thinking I would now get 1022 IP addresses? And can I set my IP address range to 192.168.120.1-192.168.123.253?

Also, any traps to look out for when changing my subnet?

Subnet change question

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator. The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s).

DHCP

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.