Particularly in the case of larger subnets, it can be useful to deal with IP addresses in terms of defined IP address ranges, such as 22.214.171.124-126.96.36.199 in a 188.8.131.52 / 20 subnet. The following procedure provides the steps required to add a range of IP addresses within a defined subnet.
By default, IPAM displays all IP addresses in a subnet if the selected subnet contains 4096 or fewer IP addresses (/21 or 255.255.248.0 and higher mask). For these smaller subnets, it is not necessary to add IP address ranges for monitoring unless you have previously deleted the addresses in the range you want to add.
To add a range of IP addresses within a defined subnet:
For subnets with more than 4096 IP addresses (lower than /21 or 255.255.248.0 mask), the right pane displays No IP addresses have previously been added unless you have already added a range of IP addresses within the selected subnet.