Wasted IPs Calculator
Calculate the number of wasted IP addresses in a subnet.
In network design, especially with IPv4, conserving IP addresses is crucial. When you create a subnet, you allocate a block of addresses. Often, the number of available hosts in that block is greater than the number you actually need. The difference is "wasted" IPs.
Understanding the Calculation
This calculator helps you see the efficiency of your subnetting. By providing a CIDR notation (e.g., 192.168.1.0/24) and the number of hosts you actually need, it will show you how many IP addresses are left unused in that block. This is particularly useful when comparing different subnetting schemes.
Minimizing Waste with VLSM
The best way to minimize wasted IPs is by using Variable Length Subnet Masking (VLSM). VLSM allows you to create subnets of different sizes from a larger network block, so you can tailor the subnet size to the specific needs of each network segment. Our VLSM Calculator is the perfect tool for that job.