Export and Import DHCP Scope
I was researching how to change the Subnet Mask of a DHCP scope on a Windows 2008 server. It turns out you can’t change the subnet without deleting the scope and recreating it. If there are a lot of customizations to the scope, though, like reservations and scope options, it’s no easy task to delete and recreate the scope. Luckily I found one page that explains how to export the scope to a text file, make changes, and then reimport it. The whole process takes only a couple of minutes, and you end up with a deleted and rebuilt scope that has all your customizations intact. Use the below command to export the scope configuration Syntax: C:\>netsh dhcp server \\”Server name” scope “scope subnet” dump>c:\dhcp.txt Example: C:\>netsh dhcp server \\Test01 scope 192.168.1.0 dump>c:\dhcp.txt That creates a text file you can edit to change the Subnet, and whatever else you want changed. Then you have to delete the scope from the DHCP manager, and reimport the text