We have about 500+ users. The majority of our PC's have static IP addresses assigned. However, we have about 50 DHCP address being assigned to IPAD's, Blackberry's and other WIFI components.
We would like to expand on this and add another 15. We have found 15 IP address that are not being used.
Current static addresses are:
DHCP: 10.57.16.200 - 10.57.16.250
Static: 10.57.16.251 - 254
Static: 10.57.17.1 -254
Static: 10.57.18.1 -254
Static: 10.57.19.1 - 254
Subnet mask for the entire network is: 255.255.252.0
We have the following IP addresses not being used:
10.57.18.205 - 220.
When trying to add another scope (within a superscope)
IP Range 10.57.18.205 - 220 (which has not been allocated statically or dynamically - checked A records to confirm) with Subnet Mask of 255.255.252.0,
We get the following error:
"Address range mask conflicts with existing scope."
What are we doing wrong.