Step 1:
Enter your Address Block Address and mask: (example: 205.68.64.0/20)    

 
 

Step 2 (Add Networks):
Enter the number of addresses you will need in each network, after applying the scalability percentage.
After entering the number for each network, click "Add Network" (or press Enter).
You may also give each network a name (up to 30 characters long) to help identify it.

Network name (optional):   Number of Hosts:  

 

 

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VLSM Calculator
Created By Louis Chanady