Networking / FREE BROWSER TOOL
IPv4 Subnet Calculator
Calculate IPv4 network addresses, subnet masks, usable IP ranges, broadcast addresses, and wildcard masks from an IP address and CIDR prefix.
✓ Free to use✓ Runs locally✓ No account needed
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Enter the values below to calculate or convert.
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Using the ipv4 subnet calculator
Enter an IPv4 address with a CIDR prefix from /0 through /32. The calculator normalizes the network boundary and displays the full allocation. /31 follows point-to-point address behavior; /32 represents a single host.
Real-world example
Example: 192.168.10.25/24 produces the 192.168.10.0 network and 254 traditional usable hosts.
Good to know
A /24 contains 256 total addresses. Most traditional LANs reserve the network address and broadcast address, leaving 254 hosts.
This tool is a planning aid, not a substitute for verifying values in vendor documentation or production configurations.