Calculate Usable Hosts Per Subnet Online
See the total addresses and usable host count for any CIDR prefix, with the network and broadcast addresses reserved. Pick the smallest prefix that fits the hosts you need.
IP Subnet Calculator
Calculate IP subnet details, network ranges, and CIDR notation
192.168.1.0192.168.1.255255.255.255.00.0.0.255192.168.1.0/24192.168.1.1 - 192.168.1.254192.168.1.1192.168.1.254256254C0xC0A8016411000000.10101000.00000001.01100100Split into two /25 subnets
Dividing 192.168.1.0/24 one prefix deeper.
Common Subnet Masks
Quick Start
- 1Enter an IP with the CIDR prefix to test
- 2Read the total and usable host counts
- 3Note the first and last usable host addresses
- 4Adjust the prefix to size the block to your needs
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Looking for FAQs and advanced options? Visit the full IP Subnet Calculator page →