A usable address range is the consecutive set of IPv4 addresses assignable to hosts, beginning after the network address and ending before the broadcast address. section 7.3.3
Find the range by identifying its boundaries:
- First usable address: add 1 to the network address; it is often assigned to the network router. section 7.3.3
- Last usable address: subtract 1 from the broadcast address. section 7.3.3
192.168.100.0/24
The network address is 192.168.100.0 and the broadcast address is 192.168.100.255, so the usable range is 192.168.100.1–192.168.100.254, containing 254 addresses. section 7.3.3
