Classful Subnet Calculator
From the Classful Subnet Calculator tab, you can generate a list of subnets based on a number of different parameters.
The classful approach to masking is achieved by adhering to the following standard classes:
- Class A - 255.0.0.0 - 11111111.00000000.00000000.00000000
- Class B - 255.255.0.0 - 11111111.11111111.00000000.00000000
- Class C - 255.255.255.0 - 11111111.11111111.11111111.00000000
The following information is calculated after entering an IP address:
- Subnet
- Mask
- Inverse mask
- Subnet size
- Host range
- Broadcast
| IP address | The IP address you specify is used as a base address when calculating subnets. To calculate a list of subnets, click Generate Subnets. |
| Subnet Mask | The subnet mask used when generating a list of subnets. The subnet mask automatically adjusts when you change any other parameters. |
| Mask Bits | Number of network (or mask) bits used when generating a subnet list. The number of mask bits automatically adjusts when you change any other parameter. |
| Host Bits | Number of host bits used when generating a list of subnets. The number of host bits automatically adjusts when you change any other parameters. |
| Number of Subnets | Number of subnets that can be generated based on the subnet mask. The number of subnets automatically adjusts when you change any other parameters. |
| Hosts per Subnet | Number of hosts within each subnet, based on the subnet mask. The number of hosts automatically adjusts when you change any other parameters. |
| Subnet Bit Mask | Mask template for the current subnet mask. |