An ISP is granted a block of addresses starting with 190.100.0.0/16 (65,536 addresses). The ISP needs to distribute these addresses to three groups of customers as follows: The first group has 64 customers; each needs approximately 256 addresses. The second group has 128 customers; each needs approximately 128 addresses. The third group has 128 customers; each needs approximately 64 addresses. We design the subblocks and find out how many addresses are still available after these allocations