What is the subnet mask for an IP address of 116.201.25.10 with a notation of /25?

The subnet mask for an IP address with a notation of /25 corresponds to a subnet mask that allows for identifying a specific range of addresses within that network. The "/25" indicates that the first 25 bits of the subnet mask are set to 1, and the remaining bits are set to 0.

Converting this notation into decimal format means that the first three octets (255.255.255) consist of all 1s in binary (eight bits each), which totals 24 bits. The next 7 bits (the 25th bit being the only one in the next octet) are used to represent the network, with the final bit available for host addresses. Therefore, the subnet mask can be written as:

• 11111111.11111111.11111111.10000000

When converted to decimal, this gives:

• The first three octets = 255.255.255

• The fourth octet = 128 (since 10000000 in binary equals 128 in decimal)

This leads to the conclusion that the subnet mask for a /25 notation is indeed 255.255.255.128, which is accurate and demonstrates the correct division of the network and host