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Home > Success Center > Engineer's ToolSet (ETS) > Engineer's Toolset Administrator Guide > Tools Reference > Advanced Subnet Calculator > Classful Subnet Calculator

Classful Subnet Calculator

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Created by Aileen de Lara, last modified by Aileen de Lara on Jan 10, 2017

Views: 9 Votes: 0 Revisions: 3

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.
 
Last modified
23:15, 9 Jan 2017

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