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ip subnetClassic tool

IP Subnet Calculator

Calculate network address, broadcast, host range, subnet mask and CIDR from an IPv4.

Use this IP subnet calculator to quickly find the network address, broadcast address, usable host range, subnet mask and CIDR prefix for an IPv4. It is useful for router setup, VLAN planning, firewall rules, home labs, documentation and fast network checks before you ship a change.

Enter an IPv4, change the CIDR prefix or type the subnet mask directly. The tool keeps both formats in sync and also handles the special /31 and /32 cases often used for point-to-point links and single hosts.

If you need to validate a block before assigning servers, printers, cameras or segmented environments, this page gives you the core subnet details without manual binary conversion.

IPv4 only. You can edit either the prefix or the mask.

SummaryEnter an IPv4 and a valid prefix to calculate.
Network address-
Broadcast-
Usable host range-
Usable hosts-
Total addresses-
Wildcard mask-

Use clear inputs to get a more useful result.