Solution

The correct answer is 130.56

Key Points

• To find the subnet prefix, we can take the given IP address (130.56.0.0) and combine it with the subnet mask to determine the range of IP addresses in each subnet.
• The organization was granted the block 130.56.0.0/16, and then 10 bits were borrowed for subnetting. So, the new subnet mask is /26 (16 original network bits + 10 subnet bits).
• Let's calculate the subnet prefix:
  • Original IP address: 130.56.0.0
  • Subnet mask: /26
  • Converting the subnet mask to decimal, it is 255.255.255.192.

So, the subnet prefix is: 130.56. The correct answer is: 130.56