D-Link DCS-1000 Manual page 40

You must highlight the camera you wish to change the IP Address and click
on the "Change IP" icon and the Change IP Address dialog box will appear
as depicted below:
Enter the new IP Address along with the Subnet Mask and Default gateway
into the respective fields and click on the "OK" icon and IPView will
automatically change the IP Address.
Make sure to save any changes you have made to keep the information
updated.
39