An organization is granted the block 130.56.0.0/16. The administrator wants to create 1024 subnets. Find the number of addresses in each subnet 

The correct answer is 64

Key Points

• The organization has been granted an IP block of 130.56.0.0/16. If the administrator wants to create 1024 subnets, they need to figure out how many bits are required to create those subnets.
• To find this, we calculate log base 2 of the required number of subnet, which is log₂1024 = 10. This means we need 10 bits to represent 1024 subnets.
• The original IP block was a /16, which means that there were 16 bits left for host addresses in the subnet (since an IPv4 address is 32 bits, 32-16 = 16). If 10 of these are being used for subnetting, that leaves 6 bits for host addresses within each subnet. 2⁶ = 64

So there will be 64 addresses in each subnet. So your answer is 2) 64.

Please note that the first and last addresses in each subnet are typically reserved for network and broadcast addresses respectively, thus they aren't usually assigned to hosts. That means in practice, there would be 62 usable IP addresses in each subnet.