Developer tool
IPv4 Subnet Calculator
Enter an IPv4 address with a CIDR prefix, such as 192.168.1.10/24, to see the subnet details.
Runs in your browser. No upload.
About this tool
IPv4 Subnet Calculator made simple.
The local IPv4 calculator shows the normalized network, mask, wildcard, broadcast address, address count and usable host range. It handles /31 point-to-point and /32 single-address prefixes explicitly; it does not calculate IPv6.
Common questions
About IPv4 Subnet Calculator.
What input does an IPv4 subnet calculator need?
Enter an IPv4 address and prefix such as 192.168.1.10/24. The result normalizes the address to its network.
Does this calculate IPv6 subnets?
No. This tool handles IPv4 CIDR prefixes from /0 through /32.