 The explosive growth and proliferation of the Internet into homes brought a growing shortage of available IP addresses.DHCP became an important tool for ISPs as well to manage their address spaces for connecting home and small-business end-users with a single IP address each by implementing network address translation (NAT) at the customer-premises router.The private network behind these routers uses address space set aside for these purposes (RFC 1918), masqueraded by the NAT device.