192.168.0.120
This says that the IP address is 192.168.0.120.
/25
This says that the netmask is 25 bits long. As an IPv4 address is 32 bits, that leaves 7 bits for the address. The lowest IP address in the range is given by masking out the bottom 7 bits, and the highest by adding 127 (=27-1) to that.