Homelab · Tool

IPv4 and IPv6 Subnet and CIDR Calculator

Enter a network in CIDR notation and the calculator works it out. For IPv4, like 192.168.1.0/24, you get the subnet mask, wildcard mask, network and broadcast addresses, the usable host range, and the host count, and you can split a network into smaller subnets. For IPv6, like 2001:db8::/64, you get the network, first and last addresses, total address count, and address type.