To find the host and broadcast address of a network, use an logical AND on the IP address and the Subnet Mask. The first IP address is usually reserved for the Network address and the last one in that block is for the Broadcast address, while the remaining ones can be used as Host addresses.
For example:
192.168.2.0/24 (192.168.2.$1$1)
255.255.255.128 (255.255.255.$2$1)