ip change procedure

We currently have 8 win2K servers running single domain architecture with WINS ,DHCP,and all standard services inside it. we got 2 DC’s and the rest was apps server. Our network team decide to stndardize ip scheme for this site and they want to reconfigure the core switch to the new ip scheme. Can u help me in outlining the procedure need to be done on the AD part during the ip change procedure? Can it be done without any downtime? TQ