How many usable IP addresses are available on a network with an address of 128.16.6.0/16?

In a network with a CIDR notation of /16, the first 16 bits of the IP address are designated for the network portion, while the remaining bits are used for host addresses. The IPv4 address space consists of 32 bits in total, which means that for a /16 subnet, there are 32 - 16 = 16 bits available for host addressing.

To calculate the total number of addresses in this subnet, you use the formula 2^n, where n is the number of bits available for hosts. In this case, n is 16, so:

2^16 = 65,536

This result represents the total number of addresses available in the subnet. However, two of these addresses are reserved: one for the network address (128.16.6.0) and one for the broadcast address (128.16.6.255). Therefore, the number of usable IP addresses for hosts is calculated by subtracting these two reserved addresses:

65,536 - 2 = 65,534

This calculation shows that there are 65,534 usable IP addresses available on the network with the address of 128.16.6.0/16.