Subnet Calculator

Enter IPv4 or IPv6. Works with CIDR (192.168.1.10/24), a subnet mask (192.168.1.10 255.255.255.0), or an IPv6 prefix (2001:db8::/48). Everything runs in your browser, so nothing you type is sent to us.

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IPv4 CIDR cheat sheet (/0 to /32)
CIDRSubnet maskWildcard maskTotal addressesUsable hosts