Computer & Networking
Subnet Host Capacity
Calculate usable IPv4 hosts from CIDR prefix.
Result
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Formula
Usable hosts = 2^(32-prefix) - 2
How to use it
Enter your values using the units shown, then select Calculate. Review the formula and the worked explanation generated with your result.
Important note
This tool provides an educational estimate. Verify critical medical, engineering, financial, or construction decisions with a qualified professional.