Subnet calculator for IPv4 and IPv6
Free subnet calculator: network address, broadcast, host range, mask and wildcard for IPv4 and range for IPv6. Runs in the browser, no data is stored.
Background
Plan networks correctly.
For an address with prefix (e.g. /24) or subnet mask, the calculator shows the network address, the usable address range, the broadcast and the number of possible devices. Useful when setting up routers, firewalls, VPNs or separate networks for guests, phones and servers.