Problem
An ISP is granted a block of addresses starting with 190.100.0.0/24 (65,536 addresses). The ISP needs to distribute these addresses to three groups of customers as follows:
• The first group has 128 customers; each needs 64 addresses.
• The second group has 64 customers; each needs 32 addresses.
• The third group has 64 customers; each needs 16 addresses.
• Design the subnetting of sub blocks and find out how many addresses are still available after these allocations.