Subnet Calculator
Calculate IPv4 networks, host ranges, and subnet masks.
Count addresses between two inclusive IPv4 endpoints.
Your result will appear here.
Enter your input, then run the tool.First IPv4 address: 192.168.1.1 Last IPv4 address: 192.168.1.254
Use the labeled units and valid first ipv4 address. 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.