Subnet Calculator
Calculate IPv4 networks, host ranges, and subnet masks.
Convert a contiguous subnet mask or prefix into network and wildcard masks.
Your result will appear here.
Enter your input, then run the tool.Prefix (0–32) or subnet mask: 24
Use the labeled units and valid prefix (0–32) or subnet mask. The Example button supplies a reproducible starting input.
Calculate IPv4 networks, host ranges, and subnet masks.
Query public PTR records for an IPv4 address.
Check IPv6 address syntax, including compressed notation.