4. Consider a subnet with prefix 192.168.56.128/26. Give an example of one IP address that can be assigned to this network. Suppose an ISP owns the block of addresses of the form 192.168.56.32/26. Suppose it wants to create four subnets from this block, with each block having the same number of IP addresses. What are the prefixes of the form a.b.c.d/x) for the four subnets