you should look into IPv4 subnetting.
a brief explanation, v4 address is in a.b.c.d format. a, b, c and d are 8bit decimal (that means 0 to 255)
to get more ip available, address is sub divided into network and host part and is called subnetting.
192.168.0.0/24 = 192.168.0.0/255.255.255.0 = 11111111.11111111.11111111.00000000
that means 192.168.0 is the network and the last 0 is for the hosts. 0 and 255 is reserved for broadcasting.