CIDR Subnet Calculator Online

101IP calculates IP subnet parameters from CIDR notation. Enter an address with a mask to get the network address, broadcast, host range, subnet mask and total address count.

What the calculator returns

• Network address — first address of the subnet;
• Broadcast — last address in the range;
• Host range — first and last usable host addresses;
• Subnet mask — dotted-decimal and CIDR prefix;
• Address count — total and usable host count.