How to fill in the subnet mask
The subnet mask divides the IP address into a network address and a host address. The steps to fill in are as follows: Determine the subnet size and convert it into a bit mask. Converts a binary bitmask to dotted decimal. Example: Create a subnet (/27) with 30 hosts, using subnet mask 255.255.255.192.

How to fill in the subnet mask?
A subnet mask is a 32-bit binary number used to divide an IP address into a network address and a host address. The following steps explain how to fill in the subnet mask:
1. Determine the network size
Determine the size of the subnet to be created. Typically the following subnet sizes are used:
- /24: 255 hosts
- /27: 30 hosts
- /30: 2 hosts
2. Convert the subnet size to a bitmask
Convert the subnet size to a bitmask as follows:
- Subtract the subnet size from 32 (for example, /24 = 32 - 24 = 8)
- Convert the result to a binary number (for example, 8 = 1000)
- Add 1 in front of the binary number (For example, 1000 = 1111111111111111111111100000000)
3. Convert binary mask to dotted decimal
Convert binary mask to dotted decimal, method As follows:
- Split the binary mask into 8-bit blocks
- Convert each 8-bit block to a decimal number (0-255)
- Split these four Decimal numbers separated by dots (for example, 11111111.11111111.11111111.00000000 = 255.255.255.0)
Example:
To create a subnet with 30 hosts (/ 27), please do the following:
- 32 - 27 = 5
- 5 The binary number is 101
- Add 1 to get the binary mask: 11111111.11111111. 11111111.11000000
- Dotted decimal mask: 255.255.255.192
Therefore, the /27 subnet mask is 255.255.255.192.
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