The online subnet calculator takes an IPv4 address or CIDR block and calculates related information about the network it defines. Use this free online calculator to determine subnet mask, wildcard mask, network address, broadcast address, and assignable hosts.
The calculator shows results in dotted decimal notation and binary notation.
View the results in an editable IP address table or print the subnet details for reference. The API offers a free method for integrating subnet calculations into your own software projects.