How to calculate subnet mask

The subnet mask is used to divide the IP address into a network address and a host address. The calculation steps include: determining the subnet size and converting it to a binary representation; subtracting the number of digits in the host address from 32 , get the number of digits in the network address; in binary representation, fill 1 to the number of digits in the network address; fill the remaining digits with 0 to form a 32-bit subnet mask.

How to calculate the subnet mask

The subnet mask is used to divide the IP address into networks 32-bit binary number for address and host address. It is represented by separating the network and host parts of the IP address, represented by 1s and 0s.

Steps to calculate subnet mask:

1. Determine subnet size:Determine the number of computers in the subnet you wish to create , called the subnet size.
2. Convert to binary: Convert the subnet size to a binary number to obtain the number of digits in the host address.
3. Subtract the number of digits in the host address from 32: This will give you the number of digits in the network address.
4. Pad 1 to the number of digits in the network address: In binary representation, pad 1 to the number of digits in the network address.
5. Fill the remaining digits with 0s: Pad the remaining digits with 0s to obtain a 32-bit subnet mask.

Example:

Suppose we want to create a subnet of 64 computers.

1. Subnet size: 64
2. Binary: 64 = 2^6
3. Host address Number of digits: 6
4. Number of digits in network address: 32 - 6 = 26
5. Subnet mask: 11111111.11111111. 11111111.11000000 (binary)

Therefore, the subnet mask used to create a subnet of 64 computers is 255.255.255.192 (decimal).

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