Limiting a scanned subnet to the upper end

Q. How do we limit the subnet that InterMapper scans to just the upper end? For example, we use only half of a particular subnet (123.456.789.yyy ) but when we enter the subnet into Intermapper and scan it, the whole subnet is scanned.

A. You can try adding a subnet using a smaller CIDR block size than you actually use.

For example, we use a 24 bit subnet mask 192.168.1.0/24, which contains the actual range: 192.168.1.1 - 192.168.1.254. To specify the range 192.168.1.129 to 192.168.1.254, you can use 192.168.1.129/25.

This trick only works if the subnets are divided by "powers of two".